The ACC always felt like it was in the worst geographical shape because they have virtually no chance of expanding west without taking a West Virginia, Memphis, Cincinnati situation. However, they seemed to have an extremely loyal membership. And there's not 1 or 2 schools who would really stand to benefit from leaving (like Texas/OU).
The limiting factors for the Pac 12 and Big12 have been the lack of major universities out west and being top heavy (USC, Texas, OU).
What I find intriguing about this whole situation is the opportunities available for G5 schools to jump. We've seen it with BYU, Houston, Cincinnati, and UCF already.
Boise, Air Force, UNLV, Co St, Utah State etc now have a major opportunity in the west.
The ACC's best bet is to look at Navy, USF, Coastal, App State, etc. Maybe stealing West Virginia. Maybe looking at Memphis and Southern Miss.