I lean toward this thinking a lot but with recent and past Big 12 moves I really think the ACC will survive and the Big 12 will dissolve. Texas is already looking at the door and when they leave OU will join quickly. Maybe OU goes to the B1G and they take UVA or UNC to join them. If they do this, it hurts the ACC but they can just add UConn. If all hell really breaks loose it's very possible it's the ACC still standing and not the Big 12. Without OU and Texas, two schools who can easily pick their conference, the Big 12 is worthless and will likely be below the ACC in the pecking order for being the final P4 conference, if that's the end game.
In reality, who the heck knows?!?