Eric Crouch won the Heisman and he was arguably one of that season's worst passing QBs. Who knows for sure how much Young will improve as a passer this season. If he stays three more seasons he may well put up big numbers. It's all speculation at this point. Best of luck.
Btw, Texas is 55-38-5 all-time over Oklahoma. (series tied 6-6-1 last 13 meetings, with OU winning the last four)