I think it depends on your team and the value you can get for him. As someone has already said, he is worth more to a team trying to win now. As a current Westy owner with a legit shot in 2008, I will likely keep him. That's not to say I wouldn't take a slight downgrade this year if I could get a younger stud, but I refuse to trade him for the likes of Darren McFadden. I did try to trade him already for Steven Jackson, and I offered a bump in this year's draft (we keep 8 players, and I offered a swap of my 1st rounder for his 2nd rounder to even up the deal). The SJax owner turned me down. I play PPR, so I foresee Westy on my squad until the wheels fall off, however long that will be. FWIW, here are the other RB's and how I see it:
Guys you'd have to take a HUGE bump down for:
Adrian Peterson - Peterson would be the backbone of the other team. The value of Peterson is sky high in dynasty, so I can't see an owner getting rid of him.
SJax - The 4-yr age difference coupled with a close ADP would make this a hard deal too. I don't see an owner of SJax budging on this one.
Joseph Addai - Again, a 4-yr age difference. Indy hasn't overused Addai to this point. He may be a top RB for many years, but will Indy ever let him become a 350+ touch guy? It's pretty strange, especially when you consider their success with Edge for 7 seasons, and he averaged 26.5 touches per game during his time there (that's an overall avg of 424 touches per year). FWIW, no FBG expert has Addai projected for more than 340 total touches.
Guys you'd have to take a MEDIUM bump down for:
LaDainian Tomlinson - Same age as Westy, and with more than twice the career touches (2823 to 1361). LT's conditioning makes me think he will continue to be a top RB for at least 2 more years. The LT owner certainly wouldn't want to get younger by only 2 months, so I doubt the LT owner would bite.
Guys you'd have to take a LOW bump down for:
Marion Barber - I want to see him perform at the top level when given a full load before I buy into him. If he does perform, next year is too late to unload Westy. A catch-22 right there, but not one I want any part of.
Reggie Bush - As a pass-catcher, yes, he can compete with Westbrook. But Reggie's 3.7 yards per carry average shows he is not in the same class as a RB. How can Reggie's YPC be so low on such a potent offense when defenses have to gameplan for so much more? Ironic that Reggie has the same 3.7YPC average as his college teammate, LenDale White. I just don't see Reggie as a top RB in the future, unless you play in a league that awards 2pts per catch.
Guys you'd get a LOW bump up for:
Frank Gore - Here's another 4-yr age difference. For all of his perceived injury-proneness, Gore hasn't missed much time in the NFL. I think the 49ers are on the rise, and Martz will find ways to keep Gore involved. I think he is the most likely candidate for a trade, and the one I'd set my sights on. Only 1 of the 5 FBG experts have Gore rated higher in dynasty (kinda shocking to me).
Maurice Jones-Drew - MJD had 212 touches in 2006, then 207 touches in 2007. Fred Taylor had 254 touches in 2006, then 232 touches in 2007. MJD finished 10 spots higher in FF in 2006, and then 5 spots higher in 2007. MJD has proven to be a great FF RB even in a RBBC. To me, it doesn't matter if Fred Taylor can have one more decent season, because MJD will get his stats. But at 32 years old, the odds of Fred having another injury-free season are pretty low.
Marshawn Lynch - Lynch is a workhorse and should be for many years, albeit on a mediocre (at best) offense. If you target him, do it now, before his legal issues pan out. Small risk there, but his value will only go up from here on out IMO. At this point he falls into my "LOW bump up" category, but he will increase to "straight up trade" if he doesn't get suspended.
Clinton Portis - I wouldn't part with Westy for a RB only 2 years younger, and with nearly 2 seasons of work more than him (CP has 1915 touches; BW has 1361). At this rate, their prospective wheels should fall off around the same time. I will take the guy with better projected stats for 2008, and to me, that's Westy.
Larry Johnson - Same age as Westy, and roughly the same wear, although LJ's wear was basically packed into 2 seasons (last half of 2005 thru first half of 2007). Westy is the bigger injury risk IMO, but LJ's baggage is pretty heavy too. Again, I'll go with projected stats for 2008 and stick with BW.
Willis McGahee - 2 years younger, but within 100 touches of Westy for his career. I see him as a medium injury risk, but I just don't see him with very much more long-term value than BW.
Guys you'd get a MEDIUM bump up for:
Ronnie Brown - Nope, not buying. Too many IF's with Brown and the rest of the Dolphins offense.
Ryan Grant - Last year's Rocky Balboa. I'd consider him if he were a few years younger, but I will shy away from a 25-yr old with half a season under his belt. Maybe he blossoms late, ala Tiki Barber, but I just can't bring myself to taking that chance.
Darren McFadden/Jonathan Stewart/Rashard Mendenhall - If God himself were a rookie, I still wouldn't trade Westy for him.
Westy already had a Lisfranc injury, and Lord knows he's perpetually Questionable, but if you can live with that Q next to his name there's been ZERO indication to this point that he's on (or even near) the downslope. He's a stud, and in PPR he's an uber-stud.
Westy already had a Lisfranc injury, and Lord knows he's perpetually Questionable, but if you can live with that Q next to his name there's been ZERO indication to this point that he's on (or even near) the downslope. He's a stud, and in PPR he's an uber-stud.
Westy already had a Lisfranc injury, and Lord knows he's perpetually Questionable, but if you can live with that Q next to his name there's been ZERO indication to this point that he's on (or even near) the downslope. He's a stud, and in PPR he's an uber-stud.
Only a team well out of contention should even consider trading him. But those thinking about it still need to beware, and not sel him short. The thumbrule of the 30 y.o. RB is just that, a thumbrule....that's becoming less true every year.Personally, I'm going to hold until there are signs of him slipping. (Unless I get that can't resist offer! 
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