Texas looks out for Texas. Thus, if keeping the XII alive is in Texas's best interest, it will do so in the way that benefits Texas, such as adding Houston (no threat, gains political points in Austin) and Memphis (no threat, gains a 'new' market on the fringe of Texas's existing territory) and it will be done. If joining the PAC or B1G provides the best benefit for Texas, then Texas will walk away from the XII in a heartbeat. The wildcard is if Texas does stay and either blocks any additions or adds a pair of schools like Houston and Memphis versus say BYU and UCF, what will Oklahoma do? If Oklahoma decides that the XII is a dead end and can find a way out (PAC, SEC, B1G) and leaves, is there anyway that Texas can see any value staying in the XII without their chief rival? Thus, if I was a conference executive and coveted some XII teams, I would focus on shaking Oklahoma loose because if the Sooners leave, the XII is dead.