I am only interested in a 16 game format if it means all FBS conferences have an auto-bid. That would be 10 automatics plus 6 at-larges. The 7th at large wouldn't really have much to gripe about at that point. The six at large bids would probably be Michigan, Georgia, WSU, ND, LSU and maybe Florida, but I'd rather the Boise or Utah state get the last slot.
https://slapthesign.com/2018/12/04/college-football-playoff-16-team-playoff-look-like-2018/
Alabama regional
No. 1 Alabama (SEC Champion) vs. No. 16 Northern Illinois (MAC Champion)
No. 8 Central Florida (AAC Champion) vs. No. 9 Washington (Pac-12 Champion)
Oklahoma Regional
No. 4 Oklahoma (Big 12 Champion) vs. No. 13 Fresno State (Mountain West Champion)
No. 5 Georgia (At-large) vs. No. 12 Penn State (At-large)
Notre Dame Regional
No. 3 Notre Dame (At-large) vs. No. 14 Appalachian State (Sun Belt Champion)
No. 6 Ohio State (B1G Champion) vs. No. 11 LSU (At-large)
Clemson Regional
No. 2 Clemson (ACC Champion) vs. No. 15 UAB (Conference USA Champion)
No. 7 Michigan (At-Large) vs. No. 10 Florida (At-large)