The most likely place for Texas to wind up, for the reasons set forth by others upthread, is the B1G. It will be, IMO, Texas and Oklahoma to the B1G at the end of the B12 GOR.
I don't think the question is where Texas and Oklahoma wind up - that will be the B1G . Rather, I think the question is whether the B1G will then expand to 16, 18, or 20.
Expand to 16 with Texas and Oklahoma and the B1G adds the huge Texas market and the Texas recruiting grounds.
However, expansion to 16 leaves basketball powers Connecticut and Kansas sitting on the shelf. Is there enough financial incentive to justify the addition of UConn and KU?
I *think* the answer is "yes", especially in the case of UConn because UConn solidifies the northern extremity of the NE Corridor. KU, the founder of basketball, and a basketball blueblood, is AAU, gives balance to the west, and completely hems in the SEC.
Unless the ACC crumbles, which seems doubtful, I don't think there's any reasonable probability of the B1G going beyond 18 after the demise of the B12 (in it's current configuration).