Honestly, and I say this as a fan of Michael Jackson, there are obvious reasons why that's a bad idea.
Not the least of which is, pop music doesn't lend itself very well to "Rock Band." You could barely rationalize having it on "Guitar Hero." As good as many of his songs were, I don't think I'd have that much fun playing any of them on fake instruments.
Now, a Michael Jackson Dance Dance Revolution would be much more fun. But I think they should wait a good long time before making one.
And if they do anything like that, I'm sure many, many people will have angry words with the game companies for hocking his wares to innocent children. 🙄