Although I think it would be cool for colleges to have on offense and defense (with a QB and LB), the finances don't work out for all of them. Unless the NCAA helped all schools or someone like Microsoft or Apple donated or offered at a cut rate, some universities would probably not be able to afford it. I guess you'd have to have helmets for each or maybe the top 3 QBs and LBs, in case they got injured or were benched. Not every school is a cash cow like the Power schools and that kind of stuff adds up.

The NFL, for all its warts, is able to control things like this with specifics/rules and the owners can easily pay for it.

But it would be cool. If I was a college coach I'd use them for some practice drills to keep the other side on their toes.