Thinking OU is going away is wishful thinking.
I'm not sure why everyone thinks the SEC is such a super league? Outside of Alabama and #2 team in the conference which can change from one year to the next really isn't any different than any other major conference. There is a power team that goes across years, and then a few other teams that will challenge in various seasons.
This last season in bowl games the Big 12 had a 71% winning percentage, followed by the Big Ten (60%), the SEC (42%), ACC (33%), and the Pac 12 (0.00%).
The way I interpret his question is, "what happens when OU stops winning at the rate it wins in the Big 12", which I do think is a fair question. You look at our program, and despite being top 10 in wins over the past 10-15 years, we aren't looked at as a powerhouse because of the conference titles and National titles. And even though, you're right, the SEC top to bottom is overrated, can OU snag conference titles from Alabama? Georgia? Definitely not as consistently as it did in the Big 12.
And it wont be a
departure from fandom - it's about the kids. When I was growing up, there were no Warriors fans. Just Bulls, Celtics, and Lakers fans. Now, you have a ton of Warriors fans, and no Bulls fans.
So I do think it is going to be an interesting case study - IF Oklahoma State becomes the team in Oklahoma that is winning the conference titles and OU, while still winning 10 games per year, is finishing behind the Alabamas and Georgias, how does that shift the future fan bases of the state?
Not saying definitively one way or another. I could be way off on this. But, could be interesting to keep an eye on over the years.