I can't see how you can deny Prince the nod at this point in time. Nebraska was expected to win the North, and some were even predicting a BCS bowl bid (we'll see in KC). Callahan had done a better job this season, but he has made a fool of himself too many times.
Weak playcalling against USC on national television and continiously losing leads in the second half and struggling to hang on to wins. Only the Texas game does he gets kudos, and some of that took trick plays for NU to jump back into that one.
Prince and the Wildcats weren't expected to do much of anything this season and here they are bowl eligible with a win over highly ranked Texas. Guys, seriously, Prince is a prime consideration while Callahan still has a lot to prove.