At a minimum, add San Diego St. (brand new stadium) and UNLV and merge with the Big 12 and call it the Big 24 Pac. Shitty programs but good locations to offset the shitty locations of the Big 12. Make Gonzaga a good offer to join for hoops and while your football would be mediocre (like it isn't already) the hoops would be pretty damn good.
At best, blow up the NCAA. Tell them you are out. Get the best remaining 48 teams that aren't in the Big 10 or SEC and create a separate league. Players are already pros. Just go all out. six 8 team conferences. Play the 7 games in your conference and then 5 other teams from the other ones. No shitty non conference games with Montana and Kent State. Make the SEC do that. An NFL type schedule. Every game means something. Then the top 16 teams enter a playoff. Or if you want to make it 3 teams per conference take 18 teams and have 2 play in games.
Bowl games are done.
Go back to basically the Pac 8, the Big 8, the SWC, the Mountain West, ACC and Big East with some tweaks. Sure, it's basically Division 2 football, but if you do it before they leave, it's division 2 football with UW, Oregon, TCU, Florida State, Miami, ASU, etc. The Big 10/SEC can have their playoff game with the two conferences, and all the non conference games with each other and with NAIA teams. We'll be over here having our 16 team playoff. We've (?) proven that we can't compete with those leagues head to head, so flank them. Wouldn't be long before teams like Nebraska realize that getting the shit kicked out of them while having to travel 1500 miles for a short league road trip for money isn't really that appealing and they would be begging to rejoin the Big 8.