re: Most impactive college football rule change

I think the plan to take away scholarships from programs that dont graduate their players is going to end up being the biggest.

for current impact, I would go with the 85 scholarship limit.
that really helped the low end of the BCS conferences and some of the high end other conferences, like say, TCU (which is now big east).

I recall that when Pitt won the national championship with Tony Dorsett, his senior class had started out with over 100 in that one class.