Nick Cave could do a one-off at Glastonbury next summer. He's played it many times but the last time was aaaaages ago. And considering next year is a fallow year...
It's worth noting that Neil's long term manager passed away a few years ago, and he was well known for appeasing Neil through firm negotiations - it could be that his new team just aren't as skilled.
Obviously not for a laugh, but could an ageing musician lose an understanding of the modern positioning of an event he previously thought he understood? Why not?