AndyJohnson - yes, agreed completely.
Let's take two (relatively) contemporary examples:
The Marion Butts era. The guy ran for around 3 yards per carry. But Parcells handed him the ball 300 times anyways. Used him right up, until the bitter end. It was no mistake that Bledsoe passed for 4,555 yards and 25 TDs, with Coates catching 96 balls. If you remember, Michael Turner had over 50 catches, and Leroy Thompson had like 67. None of those guys were WRs - all of it came from the commitment to the run, not the personnel itself. Turner went to the Eagles and Thompson went to the Chiefs, and like Patten/Branch/Givens they were never heard from again.
Fast forward to 2001 and 2003. Antowain Smith... do I need to say more? He was a good, serviceable back, but that's what he was. That's all they needed. Ball control, short passing game, commitment to the run, stout veteran defense. Hello 2 SBs. Replace with Corey Dillon, hello 3rd SB.
The commitment to a tough run game - as Andy said 30-35 times per game, will protect Brady and protect the defense as well. If TB throws an average of 25 times per game, the Pats will be a serious contender. If he throws 40 per game, we're looking at a flawed team.
Another way to look at it, and argue if you like, but it's my firm belief that if the Rams had run 10 more times in 2001 they would have beaten the Pats. If the Pats had run 10 more times in 2007, they would have beaten the Giants.
The personnel at RB is completely serviceable, and can win a SB. History has proven it.