I've thought for years that an 8 team playoff for college football would be perfect. Get the power 5 Conference champs, 2 at large, and the highest ranked group of 5 champion. Doing more than 8 puts too many teams in and makes regular season losses hurt a bit less. Less than 8 and you are leaving out at least 1 conference champ from the Power 5 and basically never letting a group of 5 team have a shot (not that I think many of those teams would have a realistic shot anyhow). Most importantly an 8 team playoff wouldn't require extending the season if you played the first round in early December. It's a pipe dream but maybe one day.