The ACC GOR runs for another 10 years, IIRC. That is, if the ACC remains as a legal entity. The loss of four Conference members may drop them below some magical number, and Poof! The Conference no longer exists, and the GOR revert back to their institutions with the dissolution. Don't have any idea if that is even a possibility, but if it is, then it is in the calculus for the SEC.
They may have made a solemn vow to A&M about not bringing another Texas program onboard, but they have since demonstrated their fidelity and honor. Florida and others might just get ready for some in-State company.
I like to think that they would keep things at 4 Power Conferences for the present. In the end, they are really looking for compelling content, and having Regional rivalries across the Nation keeps the locals interested. I know this is Old Thinking, but those matchups still have to carry some weight.
Also, with 22 potential members, isn't the B1G a little large? Are they going to shed some dead wood?