I doubt it's true because it's the sun after all. I don't think it's a good idea. She wouldn't be able to release an album for years and the workload would destroy her.
I don't know why would anyone say it's a bad idea. 450 dates would be huge and in fact there are like 5 acts right now who would be able to afford a tour like that..
Anyone ready for the Biggest Tour by a Female Artist of All-Time?