What if Florida barely beats Alabama...?

in a closely contested game, would it be preposterous to have those two teams flip flop in the BCS ratings and have them play again for the national championship? Personally, I would love to see this happen as I honestly believe the Big XII teams this year are all over-rated. All offense, mediocre defenses at best and we know where that usually leads to. If what I asked isn't a possibility then this is just another reason why we need a playoff system.