I'm good with it staying at 4, but I wouldn't object if they decided to expand it to 6, with the top two teams getting a first-round bye. I don't see a need to expand it beyond that.
I don’t like 8 or 16. I think you should reward the regular season. I prefer 6 (2 byes) or 12 (4 byes). 12 is my ideal. First 4 sit at home and watch the first round, while I get 2 Saturdays of drinking a few and watching 4 playoff games. Then you can say only conference champs are eligible for byes. You don’t win your conference, you still have a path to the title
8 works best under our "bowl crazy" system, but 12-16 would work as well.
If we're going to have a 13th regular season game/CC week, then we need to elevate conference champions. Winning ones conference is special and something which deserves a competitive edge. This shouldn't be a controversial concept, seeing as how every sport does it.
At least 5/8 slots must be for conference champions. I prefer we setup an RPI/Wolfe/Anderson & Hester/Colley Matrix like system (no predictive models like Sagarin or whatever the heck ESPN does), and have the top 5 highest rated conference champions get in. I like the concept of conference champions competing against other conference champions, and treating all conferences the same. The final three spots would simply be filled up with the highest rated at-large teams. For 2017, Clemson, Georgia, UCF, Ohio State, and Oklahoma would get the autobids, and Wisconsin, Alabama, and USC would get the wildcards. But I am willing to compromise and have a mixture of human polling and computer polling.
And if the 8 teams happened in 2018, we probably would have seen the 1st round played three weeks after CC week, and a bye week, between the 2nd and 3rd round.
If we were to go toward 12-16 teams, then the CC week would essentially go away and we either give all the teams a bye week or give the top 4 seeds a two week bye week. The only issue would be that the Rose Bowl, Sugar Bowl, and so forth would complain about having too many good teams going to the playoffs.
For those complaining about "devaluation of the regular season" for 8-16 teams, I would call it B.S. We have 131 college football teams. Taking 16 teams would be only 12% of the college football population. 8 is only 6%. Having 8 teams gives all the power conference champions, a G5 program like UCF and Western Michigan, and at-larges like 2017 Alabama and Wisconsin the opportunity to win a National Championship.
If everybody played the same set of opponents and had the same SOS level, I can see how 4 teams or 2 would work, but that's not reality.