I don't see this happening as it could mean the Big 12 would lose out on a lot of money but it's still very interesting. The SEC would go from 14 to 16 teams and interestingly we would play Vic (Texas) and Amy (Oklahoma) every year.
https://www.google.com/amp/s/www.espn.com/college-football/story/_/id/31868545/source-oklahoma-sooners-texas-longhorns-verge-making-sec-move%3fplatform=amp
https://www.google.com/amp/s/www.espn.com/college-football/story/_/id/31868545/source-oklahoma-sooners-texas-longhorns-verge-making-sec-move%3fplatform=amp