GOR is irrelevant, no different than the exit penalties that preceded it. If Texas or OU wanted to leave today, it's nothing more than a negotiation to leave. Same as the exit penalties that preceded it.
Facts are that Texas and OU no longer have the impetus to leave that they did, or more correctly THOUHT they did, a decade ago. OU is realizing they have an easy path to the CFP and the money is close enough not to matter, and the delta will only diminish as the cable subscriber model vanishes.
And Texas never wanted to leave in the first place, TPTB rightly understand that they absolutely must maintain mindshare within the state og Texas, and bailing to a far flung conference like the PAC or B1G is completely out of the question. The SEC is the only one that could make any sense. For a while, 7-8 years ago, I thought it was likely to happen. But now there's just no need for it.
More's the pity 'cause like I said, having OU, A&M, and Arkansas all on the schedule again, would be a lot of fun.