I think North Texas was Independent.
Rutgers was not 1A at the time which means they could not moved up either. Meant no Big 10 for them.
Wichita State, UTA and West Texas A&M were FBS. One dropped to D2 and the other 2 dropped football.
Long Beach State would have stayed if they got the go ahead with the NFL owner to build a big on campus stadium to share.
UCF would not become Big 12 either.

But you can't keep schools down since there are potentials to like UCF, USF, UTSA, Coastal Carolina, Boise State and the likes. There are schools like Tulsa, Liberty, La.-Monroe, South Alabama, Georgia State and Charlotte should not be in FBS. Either small spenders, too small or not enough football history to be up there. ODU did had history before they dropped.