Seriously though, when you trot out Shaun McDonald, Furrey, Roy Williams, and Calvin Johnson, you have to think that only Calvin or Roy is going to get extra attention. So that leaves McDonald and Furrey with the third or fourth best cover guys on them. Now, you trot out Bryant Johnson, Isaac Bruce, Arnaz Battle, and Josh Morgan.
How is it any different for Morgan or Battle? I mean sure, there is one safety that can maybe sit back or something or blitz or whatever because there are really no players that need to be double up on, but for the 2nd, 3rd, and 4th guys the coverages are probably darn near the same. Team didn't double cover Calvin Johnson and Roy Williams last season and leave McDonald to just frolic through the daisies.
Looking at week 4 of the season, Calvin was out, but McDonald still tallied 12 fantasy points in a PPR format. At the end of the season with Calvin hurting and Roy out, McDonald averaged around 9 PPG. He didn't have a Frank Gore or Vernon Davis to take the heat off either.
I think the OP is correct.
The 49ers will throw the ball probably a lot. The wide receivers throughout Martz's career have scored an average of a third higher than the league average. During his OC stints, that number is virtually the same. He's been pretty darn consistent in his ability to get the FF points from the wideouts no matter if it was
Chris Miller, Chris Chandler, Mark Rypien, Tony Banks, Trent Green, Kurt Warner, or Mark Bulger, Jon Kitna They've all done well. Not exactly a who's who of talent there we are talking about.
The lowest the top receiver in a Martz offense (HC or O coordinator) has ever scored is WR23...evah!

. Know who that was? The uber-talented Shaun McDonald last season in Detroit with future hall of nothing QB Jon Kitna. I think that Isaac Bruce or even Josh Morgan could accomplish that. McDonald never sniffed Bruce's job in St. Louis, he simply was never near as good.
The QBs don't matter much, the WRs don't matter much. The system matters. Somebody is going to reap the benefits of this. If I were a betting man, I'd wager that some San Fran wideout scores in the top 30 NFL recievers. That is starter material (albeit WR3 material) in most leagues. The top two wideouts in SF right now are rated outside 49 and 55. That people, is value. Drafting the 30th best player for cost of the 49th best player wins you games.