I have been trying to work through scenarios where the ACC finds 8 teams to dissolve the conference. That is the only way to make it work. The exit fee + grant of rights means no single team is going to be able to afford to make that jump. This, of course, would also involve the TV partners willing to offer money to bring these teams onboard. For the Big 10, I see UVA, UNC, Miami and Georgia Tech. The first three in this scenario make sense. They all fit the Big 10 profile. Tech is stretch, but it would be the only way to get the other three schools out. It is basically bringing UCLA along with USC. From that point, Notre Dame is left with no options, and I see them jumping on the Big 10 bandwagon along with Stanford to bring them to 24 teams.
The SEC is a little less clear. The best option would be FSU, Clemson, VA Tech and NC State. The Hokies are the only team of that four that makes a lot of sense. Big fan base, new territory in a populous state, already have a good TV presence. NC State is a slightly smaller version of VA Tech. Clemson and FSU I don't know about. They have a big market share in the ACC. I don't know if that would translate to the SEC. But again, if it is going to happen this makes sense. I don't see anyone else on the landscape that the SEC would want at this point, so I think they stay at 20 teams.
From there, my guess would be that both leagues start playing 10 conference games a year in order to offer more inventory to their media partners. It would also allow them to adopt a more NFL structure for each conference where they are split into 4 pods that play each other annually and then rotate around the other games.
I am not certain if this sort of scenario is going to make things better or worse for College Football, but it looks like it is inevitable. The money to be made, and the stability that it brings is just too great for the schools to ignore.