The ACC has fourteen. They can't all play each other every year. That's a mess waiting to happen. Even more manageable 12 team conferences (Big 10 and Pac 12) won't all play each other either, unless non-conference games are simply eliminated. And it will invariably lead to the nonsensical result of lesser teams getting in over better teams that simply played in the same conference as the best team, or worse lost a coin toss or something -- such as an 11-1 UGA being left out of a playoff in favor of a three-loss Pac 12 co-champ like Washington this year. It's a bad idea. A really bad idea.