Footy-style promotion/relegation would solve so much and is fe facto what happens, even before conferences realign officially. Non traditional powers like, say, USF/UCF, or Gonzaga in hoops, get “promoted” in the most important league, the Good TV $Pot$ League, while the sucky power conference teams, like Kansas football, never appear anywhere and get bad non conference games that will never push a top conference game off TV - de facto “demotion.”
Might as well make it official. Send the bottom two from the SEC down to the second- tier Big XII, snd send the best two Big XII sides up to the SEC. At the bottom, Big XII’s bottom two drop to the Sun Belt, who send their best two up, etc. if you wanted to have fun with it you could go down from FBS to FCS to Div II and all the way to NESCAC, so in theory Bowdoin or Colby could one day play Bama in the Sugar Bowl.