OU and TX's road to the championship is a LOT tougher from 2024 and beyond. 8+ very tough, physical games vs SEC opponents can take a toll on a team. For many years in the B12, TX and OK had maybe 2 or 3 close, tough games but, even then, Baylor, Kansas, K-State, et al aren't nearly as physical as the typical SEC team. They will have a learning curve once in the conference.
Florida definitely has a chance. Extremely fertile recruiting grounds, have previously won a couple so it can be done. Have to figure a way past UGa, though. If that game is always a loss, it will be tough to get the trophy (talk to LSU fans (v. Bama) - they know you can't lose that one game every year and will a championship).
A&M I don't think will ever get there. Jimbo is not the right guy. With UT and OK entering the conference, one of their selling points to TX recruits is now gone. They're not the ony SEC team in the state and OU's campus is very close to TX so no reason Mom and Dad can't truck on up to Norman to see their kid play big-time CFB.