Buffalo and UMass (if their FBS football program survives) would be smart additions to the AAC to strengthen their presence in the Northeast. Just hope UConn is in the ACC or B1G by then.
I do not buy Texas to the ACC in all sports except football. Except for basketball and a few select women’s basketball teams and men’s lacrosse teams, these sports only take money from athletic budgets, not give. The nearest ACC school at this time to Texas is Florida State, which is 870 miles away (both ND and Louisville are about 375 miles from their nearest ACC partner). That would cost a lot of time and money. Why would the ACC member schools take on this additional cost without taking on at least part of the revenue for U Texas football?
If the XII does die, I still believe that the PAC is the most likely landing spot (call it 50%) as Texas can still be the king of the hill in the PAC (USC being it’s only real competition) with B1G (25%) and the SEC (25%).