Who do you think should headline instead? Think Black Sabbath should be up there because they've just reformed, not so much the other two.
And seeing as they were mentioned - did anyone catch Metallica and Lou Reed on Jools Holland last week? Just awful.
I can see the whole Black Sabbath appeal, but I watched Jools Holland it was absolutely dreadful. I honestly can't suggest a headliner, but for the past few years it's been mainly classic rock bands; Maiden, Kiss, Judas Priest, AC/DC etc, it's predictable who will play.