Just my best guesses here. I think likely FSU, Clemson, UNC, and UVA go to the P2 conferences. I think if that happens Louisville goes to the B12. The interesting group after that is Miami, NC State, and VT. If they all leave then you have a conference with GT, Duke, Wake, BC, Pitt, Stanford, Cal, SMU, Syracuse. Likely some more get added (Memphis, Tulane, UConn, etc.). There are too many ACC teams that will have nowhere to go for the ACC to fall apart completely. It will effectively turn into an upper tier G5 conference though.