I think Big Ten money will be too much for Notre Dame to ignore eventually. Big Ten will already have USC. Grab their other rival in Stanford to pair up with Notre Dame and then add Oregon and Washington to get to 20 teams.
Big 12 poaches Arizona, Arizona State, Utah and Colorado.
No idea what happens to Cal, Oregon State or Washington State. Probably MWC.
Then wait for the ACC GOR to expire so the Big Ten and SEC can shred that conference apart, Big 12 picks up the remainders (Louisville, Pitt, etc.)
The Big Ten and SEC are clearly the 2 superconferences. However, I think the fact that the Big 12 has been raided so many times and lost all our big name schools that would increase conference revenue for those 2 conferences, there's really not anyone else for them to poach, unless they get hell bent on getting to 24 teams. Meanwhile, I think the Pac-12 could be right for the picking right now if the Big Ten pulls the trigger with a couple more. Then the ACC still has a bunch of quality schools that will get all taken at the same exact time (Clemson, FSU, Miami, North Carolina, maybe Duke, Virginia, Virginia Tech, maybe NC State). The Big 12 might survive as the top non-superconference league that is made up of the teams from the Pac-12 and ACC that we wanted simply cus we took a bunch of blows, but none of them fatal. The Pac-12 and ACC could each both just receive one massive, fatal punch.