I remember the '00 champ game very much so
KSU's '00 bowl game was the Cotton Bowl win against Tennessee <insert taunt to Discojunge>
Knowing how the bowls love to treat KSU, I bet even if KSU won the Big 12 the BCS would still try to find some loophole to prevent them from going to a BCS bowl
As for OU still going to the title game, I'm not so sure. Remember the NCAA pollers have that "early loss = overcomable, late loss = fuck you" policy