I think the ACC will hold on.
Big 12 as currently, I guess next year, not currently, comprised has not one game that moves any meter. TX/OK was all they had. They have a couple of basketball schools now, but as we know basketball doesn't really mean much.
ACC does still have historically relevant football teams and rivalries. ACC needs to win something this year and remind folks.
I don't think even TV execs want there to be only 2 leagues...they lose what little leverage they have left.. maybe too late.
I find myself giving less of a öööö either way really.
Unless ESPN makes a really bold move on the GOR I would agree that the ACC will hold on. Without ESPN making a play for Clemson/FSU to the SEC, those two schools are stuck in the ACC until further notice regardless the noise they make. The GOR buyout is just too big.
The BIG 12 may be stronger than you think. TCU played for the championship last year. Baylor is good and improving. Kansas State is very good and improving and the rest of the league is very competitive with any one of those teams potentially putting together a deep run. The future looks very good for the BIG 12 with the additions of Arizona, ASU, and Utah.
As a general point, people forget how quickly programs can emerge from the shadows and become formidable players for prominent buzz. TCU is a good example. Yes, they got smoked in the championship game, but no one was talking about them before last year and now they are a "hot topic".
The ACC takes way too much grief for football reputation. Georgia Tech will be back. Virginia Tech will likely be back at some point. UNC has been steadily improving and getting attention. Clemson competes at the highest level. FSU has improved though I still believe they have a lot to prove. The league is competitive.
IMHO, the ACC needs to stay a regional conference at least in the sense they stay on the east coast. If there are good programs that can be added they need to find them and add them.
As far as the broadcast rights go, Apple made it pretty clear they aren't going to save anyone. YouTubeTV/Google and Amazon haven't yet been meaningfully involved in conference realignment talk. They may yet step into the fray but I wouldn't expect them to insert themselves until the ESPN/Disney situation evolves. I still don't think people realize how bad of a spot Disney has put itself in.