A four-team playoff is perfect, it solves 90% of all of the problems with the current system. It would just be diminishing returns to include more teams.
WAAAARRRRRRR EAGLE!! HEY!!!
A 4 team playoff system is the next logical step to getting to a full blown playoff system.
I just find it ironic that the same schools that nixed the SEC’S proposal for a 4 team playoff just a few years ago are the same ones now complaining about the SEC dominating the BCS championship game.