I doubt that R^2 wanted DR to run the ball 25 times a game. However, our RB's did not perform.
The QB is always going to carry the ball a lot in a Rodriguez offense. If the tailback is a star, then they simply don't pass the ball much. In 2007, WVU had an embarrassment of riches at tailback (Slaton and Devine) and its QBs still carried the ball 243 times. WVU ran the ball 74% of the time. That's probably how our offense would have looked if he'd stayed.
Consider the 2010 UConn game - a game we won by 20 points (and thus theoretically didn't need to overuse our QB as a rusher). Denard carried it 29 times and the tailbacks 28 times, while we attempted only 22 passes. That was very reminiscent of RR's WVU days. If we hadn't trailed in so many games, we'd have put up more stat lines like that.