Espn.com' spower rankings show that having an elite rb does not tranlsate into a victory. You have to go all the way to number 8 (Ray Race) to find an rb who own a playoff game.
The problem with running a lot, even if you are running it effectively, is that it is not in the hands of the guy who can really put up points, the quarterback. Now before people jump on here and see people say "ZOMG YOU SAID WE NO NEED TO RUN THE BALL RABBLE RABBLE RABBLE". I never said you dno't need to run the ball, I said you don't really want it to be your mian offensive weapon.
AP's worst statistical year and was also when they won the most and did the best. Why? Because they could throw. So they didn't need to run it as often. We need to run the exact amount of time per game it takes to keep the defense honest. Anything more and we are hurting ourselves by not giving the ball to our qb.
Mike Mccarthy even said somewhere "Balance is not the amount of times you run the ball, it is the amount of times they (the defense) is playing you 50/50."
The most important stat to our running game is not ypc or whatever, it's attempts. As long as we run it a few times to keep the defenses honest. That's all we need from our running game and I think we have that so I'm fine with the rbs we have.