I still have a hard time wrapping my head around what could happen. IMO, the ACC "should" stay alive. In the big conference model the PAC has to add teams and the only place those teams can come from is the Big 12. And, assuming that, the next question is "How many power conferences?" If the answer is 3 x 20 then obviously it would be PAC, SEC and B1G. If it is 4 power conferences (and the Big 12 is gone) then there has to be enough left of the ACC for it to actually be a power conference. I still think antitrust is a factor going forward.
I also think the best way to handle it is if the conferences decides to proceed logically, in tandem, to evenly distribute teams as opposed to the "raiding" concept currently being employed.