If it's going to be 2 conferences and everyone else, SEC and BIG kick out bottom feeders and invite in the remaining top programs to make 20 team conferences. With 10 game conference schedules, each team meets every other year. Every game will be a marquee matchup worth watching.
Create an 8 team playoff by have 2 conference championship games in each conference. Have the 4 winners seed the current playoff. For bowl games, the remaining elite bowls will match SEC vs BIG.
For non power conference teams, the goal is to become strong enough to eventually take a spot from a then bottom feeder.