What's he going to say? He's not the one who makes the decisions on this issue. Any coach in a BCS conference will say that they like the conference that they're in.
Stoops certainly has plenty of incentive to stay in the Big 12, I won't deny that. But I don't think he's afraid of competition, either.
Being brave and being smart aren't mutually exclusive.
The Big Ten and Pac Ten had the easiest path to the National Championship for years. Now the Big 12 has it. Actually, for OU and Texas the path is now the clearest of any team in the nation. In years where Missouri or gasp...ISU...wins it the league would be called down and even an unbeaten champ might struggle to make a title game.
Being a strong conference with some legit contenders, and no playoff game, is the best route to the NC. Stoops and Brown both know that. Tressel knew it when he had that clearest path at OSU.
The conference has to seem legit with historic programs as champ, the Big East certainly does not have the easiest path just from not having a title game because most could see it wasn't even as strong as the MWC the past few years.