I don't buy it..
not sure comparing a modern day RB to Earl Campbell makes any sense..Campbell played less games, it was a different era back then. Its like comparing Men's tennis champs of the 60's-70's-80's with their wooden rackets, to the players of today, with the big headed graphite rocket launchers.
same with golf. Tiger uses an alloy metal , graphite shaft driver with a head on it as big as a catcher's mit, while Jack used real WOODEN clubs with steel shafts...can't compare the two..
in the past 3 seasons, how many teams have moved towards a RBBC? Jax, Dallas, NE, Cleveland, Oakland, Houston, Minnesota, Carolina, Jets, Miami ( ricky W. and ronnie brown ), Tennessee, Denver, Philly , New Orleans, Atlanta, etc..
now Washington might be fully embroiled in a RBBC, and the same is true for the NY Giants.
just looking at it from that perspective, you do see a rise in the RBBC philosophy..
without using math, you can just see that the talent level of RB2 on each team,has risen. Many RB2's are highly skilled situational players, like Bush, MJD, Mike Turner , et al.
teams are finding new, more creative ways to use BOTH RB's at the same time ( ala N.O.)
Going forward, the RB position is going to change ( or evolve I should say), much like the WR3 position has evolved, or the TE position ( to the point where a TE is now the #1 passing weapon on many teams), or the way the hybrid DE's have evolved ( just 10-15 years ago, DE's were 300+ lb linemen.now everyone is scrambling, trying to find the next light,fast Dwight Freeney-type).
As far as comparing, I started my research in 1978, when the NFL went to a 16-game schedule. The fact is that Earl Campbell, or any other RB from 1978-present, can be compared. The only difference is that the league has went from 28 to 32 teams.Teams used to rush more, and pass to RB's more. These two facts are undisputed. I can provide the data if anyone disagrees, but I think everyone will agree to this. With more carries and catches to go around, why is it that there are more 300-touch RB's now than there were in the past? Wouldn't more 300-touch RB's now mean that RBBC is on the decline?
I have a theory as to why. In the past, players tended to stay on one team alot longer. This being the case, the coaching staff wanted to take precautions to minimize the risk of "overusing" a RB. Teams thought more long-term about their players than they do now.
In 1978, there were 16 out of 28 teams (57%) where the RB1 had at least 50 more carries than RB2.
In 2006, there were 28 out of 32 teams (88%) where the RB1 had at least 50 more carries than RB2.
Now, on to that list of teams you claimed were "moving towards RBBC" over the last 3 years.
JAX - Fred had 260 carries in 2004, with Greg Jones the next highest at only 62. In 2005, Fred got injured and only played in 11 games. Greg Jones got the bulk of the carries in Fred's absence. Fred ended with 194 carries, and Jones had 151. The next highest RB was Alvin Peraman with only 39. JAX was forced to go RBBC in 2006 because they had a healthy rookie stud and an aging injury-prone one. But this team doesn't qualify for "moving towards RBBC". If anything, they will now be moving away from RBBC.
DAL - JJ was the new kid on the block in 2004. Eddie George took the bulk of the carries for the first half of the season, and JJ took over in the second half. They were hardly RBBC, even though the EOY stats may suggest. In 2005, JJ had nearly double the carries than Marion Barber (257 to 138). In 2006, the carries were split almost identical to 2005 (JJ with 267, MB3 with 135). The only reason DAL seemed to be RBBC in 2006 was MB3's 14 rushing TD's. Had he gotten 5 TD's (like he did in 2005), there wouldn't be talk of RBBC.
NE - In 2004, Corey had 345 carries, nuff said. In 2005, Corey missed 4 games due to injury, but still had 209 carries. The next highest was Patrick Pass with 54. In 2006, NE was in the same boat as JAX (aging stud and rookie stud). Again, they will be moving away from RBBC.
CLE - In 2004 they were RBBC with Green/Suggs. In 2005 it was all Droughns (309 carries). In 2006 Droughns had 220 carries, but he missed 2 games. Jason Wright was RB2 with only 62 carries, but 33 of those carries came in the 2 games that Droughns was out. CLE now has Jamal, so I see no reason to think they are a RBBC team.
OAK - In 2004 they were RBBC (top rusher was Amos Zereoue with only 112 carries). In 2005, Lamont Jordan was a workhorse. In 2006, they went back to RBBC. OAK does qualify to be on the RBBC list.
HOU - In 2004, Domanick was a workhorse. In 2005, he had 230 carries in only 11 games. In 2006 they were clearly RBBC. I don't think they qualify as a team moving towards RBBC, because they just picked up Ahman, who should see the lion's share in 2007.
MIN - In 2004 they were RBBC (top rusher was Onterrio Smith with 124 carries). In 2005 they were once again RBBC (top rusher was Mewelde Moore with 155 carries). But in 2006, Chester Taylor was a workhorse with 303 carries. I know AP is in town now, so 2007 may be RBBC. But we all know that by the end of 2007/beginning of 2008 that AP will be a workhorse.
CAR - Nick Goings led the team with 217 carries in 2004, but only because all the other RB's were getting injured. He was the only one to play in all 16 games. The next highest total was Brad Hoover with 68 carries. In 2005 they were RBBC with Davis/Foster. In 2006 they were RBBC with Foster/DeAngelo (but Foster did nearly double DeAngelo in carries). CAR does qualify to be on the RBBC list.
NYJ - Curtis Martin was a workhorse in both 2004 and 2005. He got injured in 2005 and only played 12 games. Cedric Houston became the workhorse during that time. In 2006 they were RBBC. Will they be RBBC in 2007, now that they have Thomas Jones? I doubt it, but time will tell.
MIA - RBBC in 2004 (Sammy Morris top dog with 132 carries). RBBC in 2005 with Ronnie/Ricky. Not a RBBC in 2006 (Ronnie had 241 carries). They were RBBC for two years, but they are certainly moving away from RBBC, not towards it.
TEN - Chris Brown had 220 carries in only 11 games in 2004. Antowain Smith picked up the slack in the 5 games Brown missed. Brown gets 224 carries in 2005, but manages to play in 15 games. Travis Henry picks up the slack and finishes with 88 carries. Travis Henry emerges and carries 270 times in 2006. They certainly weren't RBBC (Brown and LenDale combined only had 102 carries). Will Brown, White, or Henry emerge this year, or will it be RBBC? Since we don't know yet, and since they weren't RBBC in 2006, I don't think they qualify.
DEN - Reuben had 275 carries in 2004. Anderson/Bell were RBBC in 2005. Bell/Bell were RBBC in 2006. Until I see Travis Henry getting the lion's share in 2007, I say they qualify as a RBBC team.
PHI - Westy has been a stud the since 2004. He may not have the number of carries for a workhorse, but that's because he is a pass catcher too. No way is PHI a RBBC team.
NO - Deuce was a workhorse in 2004. They went to RBBC when Deuce got injured in 2005. In 2006 Reggie came to town. I foresee another RBBC year in 2007, but then it will be all Reggie in 2008.
ATL - Dunn has been ATL's workhorse for the last 3 years (265, 280, and 286 carries).
From your list of 15 teams, I think only 4 qualify. RBBC isn't really a philosphy. It's more like what happens when injuries occur, or a team's best RB underperforms.