Don't know the legitimacy, but I love to speculate so here goes. This would be a big move if it were true. It takes a lot of balls for Dana White to fire Anderson Silva, especially because in my mind it would delegitimize the middleweight title, everyone would know that AS is the best. That being said, now is the best time to do a move like this because there's no place for Anderson to go, there's no other really big market.
I have to think that Anderson stands to lose a handsome sum of endorsement $$$ if this fight moves from Brazil to America. Yes, Anderson is a diva, but I can understand why he'd be reluctant to relocate.