If only twenty is the end point then NC State and Virginia Tech end up in the opposite conference that North Carolina and Virginia end up (SEC or Big). Virginia to the BIG and UNC to the SEC would be my guess.
Question mark on SEC getting FSU because of Florida and Clemson because of South Carolina. But where do they end up if the BIG is at twenty? If UNC and Virginia go to the SEC then the BIG takes FSU and Clemson? I think they take Cal and Stanford first.
Question mark if BIG even wants ND at this point and would just prefer them to wither up and die. I’m sure the media would convince them otherwise so slot out one of the mid Atlantic schools for ND unless it’s NC.
Ironically Duke could be in trouble. Their value lies in going in tandem with UNC and UNC wants them to wither and die. Duke unlike ND is hated by everyone even here in NC.
If conferences go to 24 which I believe they will then it becomes easier to predict the demise of the ACC because the Big12, SEC and BIG will certainly take the best of the rest in the ACC and PAC and G5. Unless they prefer any B12 schools. Kansas and maybe U of A would be possible.
Given your scenario what other teams besides UNC and FSU does the SEC want to get to twenty or twenty four?