Like them or not Boise State has proven they can play with anyone in the country. They might not play the schedule everyone wants them to play but when they do play the big boys they have won everytime.
A playoff has a very good potential to be more unfair and liable to fixes for the Alabamas, Notre Dames, USCs, Michigans, OSUs, and Texas' of the NCAA's big markets to get into the playoffs.
The BCS is not perfectly fair (AND I didn't say it was) but just let a playoff system come into being and watch the pieces get moved on the board to increase chances of certain teams' entrances to the playoff.
I also did not imply it was fair either, just that in my opinion it will be worse (less fair) when a playoff is figured out and agreed upon. We shall see.