I have seen quite a few posts claiming that the ACC will either be dead or well behind the B-12 once this situation unfolds. Personally I believe that this take is quite an overreaction.
For the sake of argument, let's assume that in the near future an agreement is reached where getting out of the GOR is a negligle amount of money. With that, there is still a very substantial (and enforceable) exit fee, which will make departing from the conference prohibitive unless the result is a spot in the B1G or SEC. I imagine that at most four current ACC schools can make this move (FSU & Clemson are the clear candidates, likey UNC and perhaps UVA as they do have some gravitas and prestige).
At that point, will there really be much difference in market power & brands when comparing the B-12 and the ACC? The idea of a current ACC school paying a nine figure departure fee to join at best a marginally better, slighty higher compensated conference seems implausible to me. Yes, there will be further separation between the P-2 and the next two (ACC. B-12) but there won't be a material amount of difference between the two next two conferences.