As someone who watches the ACC closely and as a grad of one ACC school, I think any Lone Star State school not named UT would be unlikely in that conference. UH would be on an island like WVa is now and unfortunately for UH their US News rating is even worse. At least Indiana (ND), Kentucky (UL), and Virginia (UVa, Va Tech) are contiguous states. (Even if UT joined, they would need an ND type deal b/c of the LHN. Their non-revenue or Olympic sports would not be on the ACC Channel, unlike ND who will get a full share of that. It is well known that they entered into negotiations with the ACC in 2011 only to leverage the Pac 12. Also, former AD Deloss Dodds told their boosters UT had no interest in joining a "midwest conference" (the Big 10). Even Pac 12 membership would take them out of Eastern times with their games. They didn't like the SEC b/c there was no interest in improving the academics there. Unless it is partial membership with the ACC, the LHN will keep them out of every other conference as full members through 2031 so I think they will stay home. If UConn becomes a member of the Big 12, they will be safe for the next 15 years at least.)
As far as the ACC itself, the new GOR locks everyone in until 2036 and there can be no threats of leaving if a BB school (with an FBS (1-A) FB team) in the US News top 100 is added. I do believe that the academic schools now will block any single new candidate not in the US News top 100. They didn't do that in 2012 b/c of perceived instability but that is gone, long gone with a GOR going to 2036, and even FSU with a large research enterprise seeks to become an AAU member. The only exception to that I think would be if the Big 12 came to an end - OU, OK State, Kansas, and WVa with UT as a a partial member could be possible, but an 18 team conference plus two partial members is a pipe dream at present - smoking something other than tobacco from North Carolina.