In an interview, just after this year's event, with BBC Points West, Micheal Eavis said he intended to continue until he is 80. He was 73 at the time of this year's event.
"and judging by this article has been consuming magic mushrooms" I suggest you read the linked BBC article properly. It seems like a very good way to help boost ticket sales and the festival's income.
"then killed it off by putting a rapper on as the main 'attraction' !!!!!" Far from it they were experimenting with something different and Jay-Z proved a big hit when he performed.