I'm pretty sure he still does, a Michael Jackson tour is not a stroll, it causes him a lot of pain and he loses a lot of weight (for some singer this would be a good thing).
There are many much younger stars in their twens/thirties who I hear complain about touring, too, i remember R. said on his show to his fans: I#m 30 and I#m completely finished, so, soon after that he canceled his shows. And this guy has not to dance like Michael and he is younger, he also started when he was much older than Michael did.
If people do a tour they do it for the money and not because they like it so much, TT were broken, than they reunited and did a tour.