If OU leaves, OK State is going with them. The same thing can be said with UT and Tech and I wouldn't be surprised if they all went together to the Pac-whatever. There's no way Mizzou, Kansas, and Kansas St. end up in a non-BCS conference. Look for them to go to the Big 10 or Big East.
Hopefully, things get so messed up that the remaining D-1 schools in Texas besides UT, A&M, Tech, and TCU decide to form their own conference and add a few other schools like Tulsa, Southern Miss, or New Mexico. The more likely scenario is we just get picked up by the MWC or C-USA/
UNT can't really lose in a major change up. Sure, Super Conferences might form, but in the grand scheme of things we'll still be in the Sun Belt and on the outside looking in along with about 60 other schools. Sounds about how things are right now if you ask me.