I would be very suprised if Motley Crue don't do it next year as part of their Final Tour, and if they do then I can't see BJ doing it too.

I've always thought that there's no reason that they couldn't do it ... considering Def Leppard and Aerosmith have headlined twice, I can't particulary see why Andy Copping or the festivalgoers as a whole would particulary have a problem with it, so my guess is that maybe Jon is hesitant to do it