In fairness, it's not a RB, it's LT.
As for our running game, it's good, and our AYPC is good, too, but have you really seen us take over a game by running it down a team's throat yet? We've ended several games by wearing teams down and finishing with the run, but primarily we win by letting teams make us temporarily one-dimensional and just beating them with that one dimension anyway.
In any event, I'd consider a legitimate superstar at just about any position for this team. I'd much rather see us tool up to win the next year or two and worry about years 3, 4, 5, 6 down the road. A career-ender for Tony Romo would make whatever we get with our two number ones next year largely irrelevant, and/or we could go the way of Philadelphia pretty quickly.