The one thing the Euro soccer leagues have over any American sport is that whole deal where the worst/best teams at each level move down/up to the appropriate league. That is just plain smokin’ cool.
I think it would be cool to adopt that to college football. Forget conferences, have the best 13 teams all play each other, and see at the end of the year which one has the best record. Every year, the bottom three drop out, and you bring in the best three teams from the second-tier.