Hmmm, I don't listen to any off that list regularly, so it would be of no consequence to me if they stopped. Although I might do a little jig for joy if U2 finally did the decent thing and threw Bono into a bear pit. And I'd probably be a bit sad to see some of those other institutions fold - but other than making me dig out some of their back catalogue, I don't suppose it would change my listening habits.
Oh, and Sabbath reunion, with a broken down singer who can't sing any more and a drummer who is a heart-attack waiting to happen? I hope it kicks arse, but I've got a horrible feeling it wont.