What he is saying should be taken seriously, because he's far from alone. Men's basketball fans, unless they also care about football, are having this reaction because, from a men's basketball perspective, leaving the Big East for the Big XII is not what you want. From that perspective, it's not what I want emotionally. Unfortunately, however, turning it down, even if you don't care about football, would require you to think the Big East is guaranteed to be a national player with the P-5 (or less) conferences going forward in hoops, and we can't count on that. I view the offer as one we probably have to take, but not one that will make me happier as a basketball fan in the short term.
And while I don't expect either conference to invite us, for all its issues (stuck in a bad contract that undervalues their schools compared to what the Big XII is getting and the fact that its TX--OK departure hasn't happened yet but will someday), I would still rather take an offer from the ACC than the Big XII for geographic, rivalry and like minded institution perspectives.