I still always view college football through the lens of regionality, and see realignment moves as good or bad based on that. I think teams that really benefitted from realignment are Texas and TCU moreso than anyone else. Texas got all three of its historical rivals back. That's great for the fanbase. TCU got back at least a couple (Baylor and Tech) and is playing several other regional-ish teams.
I'm not sure any other teams have been served too well by realignment outside of the money (obviously a big deal, but not my focus). Nebraska has no rival on their schedule that anyone cares about as much as they would a game with Colorado, much less Oklahoma. CU's move to the PAC made some sense (alumni base out west) but they're back anyways. Don't get me started on west coast teams in the B1G and ACC. As for OU... I don't know. The top half of the SEC is just so deep that even perennial winners can easily get lost in the mix, and once you slip it can be hard to regain your footing. I don't think OU will become Arkansas. But it's also not an impossibility.