As much as I think the conference stuff is way overrated, the best way to expand the playoff but keep the regular season meaningful is to go to only 6 teams.
Eight teams would likely include undeserving teams who could hit multiple bumps and yet sneak in.
I’d be fine if we went to six teams with each P5 champ automatically in and the committee is there to pick only the at-large 6th team and to decide seeding. In my scenario, top two teams get a bye. I think I’d also play the 3-6, 4-5 games next weekend so all teams get a few weeks off before the final four playoff games.