CBS isn't "locked" into anything. Usually, CBS goes up to about 10 days before kickoff before deciding which SEC game to show on a given weekend. One reason why they pegged the Tenn-ND game so early is there isn't anything on the schedule involving an SEC team that is nearly as attractive a matchup (Georgia-Kentucky? Florida-Vandy?). That is, there isn't an attractive alternative...yet. Now, if ND is a top team come 11/6, then, yes, I can see them sticking with that game, but if they tank (and Tenn is not a top 10 team, either), then I'm sure they'd warm up quickly to an LSU-AU game if both teams are still riding high in the polls.