There have been seasons where the Championship games were better than the Superbowl matchup. Right now there are 15 teams that a team can never ever play in a Superbowl. I don't like that. I'd want a system where any two teams could meet in the biggie. Why not just have the 8 divisions but no conferences? Make it to where every team could play anyone.
I'm also having 16 teams in the playoffs, that keeps these last few weeks more exciting, not so many teams packing it in.