Almost everyone here knows more about this than I do, but here’s my two cents.
1) Of the ACC, Big, and PAC, the ACC is the weakest.
2) None of those conferences are looking to expand with schools from the Big 12 leftovers or the AAC.
3) The only remaining move that makes any sense would be for UVA & UNC to be gobbled up the Big or SEC.
I’m not saying this is likely to happen. I’m just saying it’s the only move that works for the Big, SEC, or PAC.