I would much rather expand into North Carolina and get UNC, and Virginia to get Va Tech.
If tu comes in with OU, A&M is right back to where it was in the big 12, but actually worse from a competitive standpoint. A&M would lose its draw as the only SEC Texas team and it'd be stuck in a division with tu, OU, LSU, Bama, and Auburn. Not a great recipe for 10+ win seasons.