If there is a series of expansion, its a slam dunk WVU ends up in ACC. They will for sure lose teams
B1G and SEC are too far ahead, you can't say no forever.
Big 12 has more to lose with losses of the big 2, , but the ACC has many more teams coveted by those 2 conferences. They would also still be a viable conference due to the fact they have good programs that won't be invited, due to overlapping markets among other things.
FSU and Clemson likely aren't going anywhere. I've heard FSU to b1g but that seems unlikely, Virginia, GT, UNC, Texas or even Oklahoma seems much more likely. SEC its long been rumored would take VT and NC STate.
Your still left with clemson, fsu, Miami, duke, louisville, pitt, syracuse etc. WVU is the only real obvious addition, probably Uconn which im 100% on board with because of old big east. (we played the slow game after getting raided first, we will eventually be the big east with a new name...just no rutgers or temple, sad as that is, and possibly vt) I would hope that TCU and Baylor would be looked at before going the cincy, memphis, ucf route and it seems to make common sense.
The wrench is the PAC, they need to get to 16 as well and they aren't near the big 2. if you look deep into their contract its actually worse overall than the big 12 and the ACC. WHy would texas go there when they can go to the b1g. Not sure what real options they have other than lower level teams.