Hate to say it, but when it comes to a sport like football, most schools, including some current lower tier FBS schools, will eventually scale back so that they have very few, if any, scholarships going to football. I could see a future where most schools are playing non-scholarship football. Many will eventually drop football entirely. I don't see the game growing in terms of number of schools. I see a select few. Maybe the top 50, or even top 20-30 pricing themselves out of what everyone else can afford. At some point, many will realize it's not worth it to be a MAC, Conf. USA, Sun Belt school and those conferences will go away.
I agree with the recent argument Mark Cuban made about the NFL being too greedy. I think it will happen to college football as well, already has. The big boys getting fat on all of the profits will eventually price everyone out of the game and when you only have 20-30 top schools competing (no real under dogs) eventually interest will fade. They will kill themselves.