I think it comes down to whether the B1G has the foresight to raid USC/UCLA/Oregon/Washington (and maybe 1-2 other AAU P12's) and then try to then get the best of a scared ACC to figure out how to kill the ACC GOR and split between the B1G and SEC. Do that and we end up with 2 superconferences breaking away with 40-48 schools.
But even that game plan might not be enough to keep the B1G's elite from bolting to what I think is the SEC's preferred end game: A single SEC-based premier league that takes 32 schools and breaks away from everyone else.
The time for the SEC to do that is in the next 2 years. Add USC, UCLA, Oregon, Washington, ASU, plus Penn St, Ohio St, Michigan, Wisconsin, Iowa, and Nebraska. That leaves ND with no choice but to join, and Clemson, FSU, UNC, and UVA then do what it takes to escape the ACC GOR.
New league sets their own rules. Expanded rosters, pay for players, 14 (or even 16) regular season games, and of course their own playoffs. Printing money.
But of course that radical change could result in Congressional intervention. So best to not state the end game yet. But it probably only takes 2 of USC, Ohio St, Michigan, Wisconsin, or maybe Penn St applying to the SEC for the dam to break. If the B1G loses two blue bloods or one plus the primary Pac grab, they know they'll be at best relegated to a permanently lower paid distant 2nd to the SEC. Those that can get on THE gravy train quickly bail.
Some of the analysts and insiders think 4x16 will be the end game (I'm very skeptical, but what do I know?) but there's an awful lot of, 'Tip of the Iceberg' comments from those actually in the industry. If 4x16 were the likely result it doesn't seem like it would provoke the concern filtering out on background from so many P4 administrators. They would all (and most of the B12 left behinds) have a place at the table in the 4x16.
As to the B12 left behinds (and I hate what is happening to them, and take no joy in their angst), if 4x16 doesn't happen, perhaps the best results for them is the 32 premier league forming. That at least leaves a lot of prominent schools (albeit secondary brands) on the outside, so a good quality next level group of conferences can reorganize and continue with plenty of TV coverage of games. Back to a more traditional student-athlete experience. Still better than the G5, though pulling up some of the best G5 schools to maintain critical mass.