I think the strength of his material, and his legendary status, coupled with the seriously high production levels he would use would make him a viable live attraction.
Let's face it, plenty of musicians can make a living taking out a 'version' of a band in which they were famous - and plenty of others make a living as 'tribute' acts.
That said, there is enough of a fan-base for a stadium tour which should address some of MJ's financial constraints.
I wouldn't go and see him for the same reason I won;t go and see The Specials - it's not going to be Michael Jackson, it's going to be a fifty-plus guy with the same name who used to be famous, and is living on past glories for paying audiences who believe they are re-capturing their youth,
The essential aspect of pop is that it is of the moment, and when that moment is gone, everyone should let it go, appreciate it for its time, and move on.