I would think that MJ's death might unite fans instead of everyone arguing over whether their faves are worthy enough to do a tribute. That's complete ********. This is about Michael and the fans, not a spotlight for other artists to shine.
I think this is the best thing they could've done, and I could see some amazing performances coming out of this. I hope some rock artists can cover MJ's "heavier" tracks. Foo Fighters performing Beat It with Eddie Van Halen reowning the guitar solo would be

x5000. I could also see Linkin Park SLAYING Dirty Diana.