Thinking about it more, I would have 4-16 team conferences, total of 64 teams competing for the D1 national title, if you are not one of the 64 teams, join the next level of football and create your own playoff system.
Each conference has 4-4 team divisions, each division winner advances to a conference semi-final, then on to a conference championship game, then into a final 4 of college football, play it off, no committees to pick teams, you win and advance, regardless of your record, just like the other divisions of college football and the NCAA basketball tournament.