Ideally, it would be nice if we seen 9 conference games and kept 4 non-conference games. This would hopefully allow enough team rotation in a divisionless format to play teams frequently enough to build rivalries within conference in addition to currently rivalries, and allow teams to renew non-conference rivalries that were lost.

Also looking back the past 8 seasons at how 4 team conference playoffs for the conference championships would work for the P5, if conferences can figure it out logistically, I think you would need 14 teams min. to make both semifinals entertaining and not pairing a top 5 team with a 6 or 7 win team that finished 4th in a weaker P5 conference (happened a bit in a 10 team Big 12 and a few times to the PAC-12). This wouldn't complete get rid of that issue happening completely as it happened to the ACC a few times and even SEC once, but 14-16 teams would likely reduce the amount of times of this occurring.