At total yardage league-wise? I don't think that Rodgers will get that one. Mainly because of the pass heavy offenses of the Patriots, Colts and Saints. Especially the Brees, with Bush racking up huge yardage because he's only helpfull on screens and some good receivers. You get my point.
Crabtree as the leading receiver of the league? I foresee an ankle injury this season. They don't have any viable receivers, apart from a declining Isaac Bruce, but they don't have any viable QBs either. Shaun Hill is ok, but the 49ers should be running it a lot with Frank Gore, making the receiver's yardage even lower. On 66-1, I guess you could put down a couple of pounds, though.