I think we are seeing the same thing but looking at it from a different angle. I'm certainly not delusional expecting either team to come in and dominate as they have the Big 12. I'm not going to speak for Texas. They're going to do what they're going to do and politics with boosters is still going to be an issue.
With Oklahoma, you're right. They won't come in and win the SEC championship 75% of the time....but they will field better squads consistently. Winning all of those Big 12 championships and being in the natty race hasn't translated to a national championship in 20 years. By Oklahoma standards, that is a failure, regardless of regular season success. I'm fine with going up against Alabama, Georgia, LSU, Florida, etc etc and fighting it out every year. Recruiting will improve, particularly on the defensive side because players want exposure. Playing for a premier program against premier competition will give them that exposure. Both programs have become stagnant outside of conference play because they know it doesn't take much to with the conference most years and it shows in the post season. Through the test of fire iron is forged. It'll be rough at first but long-term, this is the right move.