I'm sure they do when the coach in question is really in danger of losing his job. Pearl most certainly is in danger of losing his job. I don't think it's fair to say the same for Tressel - I think there are a lot of differences that make Pearl's situation much worse. But in any event, all those FB recruits had already signed LOIs to go to OSU before Tressel got in trouble. This is a case with Brooks where he really should have an open mind because he hasn't committed or signed anywhere, and would have to heavily consider (i.e., eliminate Tennessee as a choice) it because you really don't know who's the coach.
Tennesee basketball is also not Ohio State football. Even if something happens with Tressel it will still be Ohio State football. Tennesee basketball may find itself buried in a very strong SEC East, playing in front of 10,000 fans in a 25,000 seat arena.