I understand what you are saying, but I don't think that what you suggest reflects the reality of the NFL. I think that the reason players like Vince Young, Mike Vick, Scott Frost or other running QBs succeed in the NCAA so wildly is because they are usually the fastest player on the field. Once they get to the NFL, they find that not to be the case at all. Your average LB in the NFL clocks in at around 4.5 or so, plenty fast enough to at least keep up with some of the fastest running QBs in the league.
On top of that, QBs that run are highly succeptible to injuries. Every player on the defensive side of the ball is an effective tackler, much different from the NCAA.
Put it to you this way. In the NCAA there are about 7200 Div-1 players. Of that group, a little more than 200 will be drafted, and a little less than 200 will actually make an NFL roster. So spread that out over the entire NCAA and you are talking about an average of approximately 1-2 NFL-caliber players per NCAA team. That explains the success of running QBs in the NCAA. In today's NFL, you truly can't design an offense with a running QB. That's why you don't see teams running a Wishbone or anything like that. Plain and simple - defenses are too fast.
Anyway all this is not a slight on Vince Young. I think he's going to have an incredible season and should be a treat to watch. I just don't think he's going to be a great NFL QB.