The cluster-F that is the Big 12 south is strickly a problem for the Big 12. Yes it has BCS implications BUT the same problems would exist in a playoff world. I won't go into this further because I need to head off to work soon. What I will do is defend my point by linking you to BCS conference tie-breakers to show that BCS ranking is not nearly as important a tiebreaker, if at all, in the other BCS conferences.
SEC (scroll down)
Big East (PDF file, chrome users Beware!)
So only the Big East uses the BCS rankings as such a high tiebreaker as the Big 12. The other 4 conferences use it as the last resort or next to last resort before flipping a coin or drawing lots. But people still blame this 3 way 1 loss tie on the BCS. Set up a playoff scenario that does not completely screw 1 if not 2 of these teams. Then tell me who your precious playoff would handle Missouri winning the Big 12 Championship.
I say it to be snarky, I say it to raise a point:
The Big 12 should have a playoff.