Here's the bigger problem. USC/UCLA and Texas/OU could move, because they were able to fund that move. UVA/UNC isn't worth $100m. FSU/Miami are not worth $75m. If they were, they wouldn't be being paid $17m
The ACC exists as it is for a reason, and you can see very clearly on ESPN. It is a basketball property, who also plays some football. ESPNs top games are Duke/UNC, all the time, even when Duke/UNC suck. They are constantly promoting those brands, like they're constantly promoting Alabama/Georgia. And then, you get some football played and teams get ranked so that gives you a boost, but a lot die on the ACCN. They're 75% basketball, 25% football.
So the B1G/SEC are big, massive football brand conferences, who also play some basketball (75/25)= big football money
The Big 12 has crazy basketball and also has fervent football fanbases, but not as brands (50/50)= hybrid money
The ACC has basketball brands, who also play some football (25/75)= basketball money
The Pac 12 had USC (football)/UCLA (basketball) with no other real defined marketing cache outside Olympic championships. Yes Oregon is a known brand in football and Arizona is a T2 basketball brand, but, they're not USC/UCLA.
Napkin valuations on what's left would probably have me lay it out this way:
60+m = none
50+m = FSU, Oregon, UW, UNC
40+m = Arizona, ASU, Clemson
30+m = Colorado, Stanford, Cal, UVA, VTech, Miami
20+m = Utah, WSU, NCSt, Duke, etc etc
None of these schools bring enough value any more to the B1G/SEC. You will start to water down the valuations because there aren't any more inventory slots left. So you have FSU join the SEC, that pushes one current game back to the SEC Network. The only way Oregon/UW/Stanford/Cal get to the Big Ten is if the Big Ten negotiates a new late night deal with ESPN and those schools go to it. But it won't pay the Big Ten $400m, it may make $200m, so they'd come in at half and at the next contract everyone would make slightly less to catch them up.
The only real move left is either uneven sharing of post season revenues, or move to the Big 12. If your conference is making $20, but you're worth $40, everyone is rising off that $20m difference. But if you're worth $40 and they're worth $32, now you're rising more to your level, everyone makes more. Oregon/FSU are paid like $20m in their current deal, but $35 in that move. You make less than you're worth, but you're much closer.
At the end of the day, I think they all stay and we see some form of uneven sharing, a bonus structure if you get into the CFP playoff and/or generate a lot of shares in the NCAA tournament. Because if they pay FSU for football, UVA/Duke/UNC will want the basketball.