A lot of people don't realize the subtle (not-so-subtle in some cases) shifts in HAVE vs HAVE-NOT that have occurred due to NIL
When it comes to huge fan bases and locations in Metro areas of over 2 million that they have to themselves and do not share with an NFL team, Ohio State and Texas are it. They are a tier of their own moving forward in terms of sustainability.
Alabama does have a large fan base, and some of them have money, but their location in Tuscaloosa does not help. They may not have a seat at the big boy table much longer.
Eugene will not be of much help to the ducks after Phil Knight passes to the duck pond in the sky
Georgia appears to be doing OK, despite sharing the Atlanta–Athens–Clarke County–Sandy Springs Combined Statistical Area with Georgia Tech and the Falcons, for NIL purposes. It's still too early to tell where they will end up long term. This is about NIL sustainability; not coaching or anything else. So the time-frame for judging this is decades.
While some former mid-majors like Maryland might occasionally bump up a tier for a few years; in terms of sustainability, the Buckeyes and Longhorns have it made and will not have to sweat the occasional big name going to the Terps (or whoever).