Harbin point system-top 32 teams with a 5 week playoff season. Works great in many state High School championships. Why not College? 1 plays 8, 2 plays 7 and so on in each region. 4 regions.
How many games would that add? Far too many with the current team schedules. If you cut that back, you end up taking home games, and money, away from schools that desperately need it for other sports to function.
32 or 16 teams in a playoff with a 12-13 game schedule is far too many for college IMO.