Tot, you are in possession of a wealth of misinformation...
Avatar is fictional, yes. So is Lord of the Rings. Casting Lord of the Rings with a bunch of black and asian people doesn't make sense because Lord of the Rings draws much of its history from European elements.
No, it's a grassroots movement led by fans of Avatar: The Last Airbender, not all of whom are Asian.
I don't get this sentiment. It's the same reasoning that people give for any injustice, ever.
Black people can't vote? Hey, it's the biz.
Black people can't act? Hey, it's the biz.
Japanese people in internment camps? Hey, it's the government.
Manifest destiny? Hey, it's the biz.
etc.
And how can you doubt that Kung Fu would have been more interesting with the creator of the show that he expected to star in? He was the most talented martial artist of his time and probably our time as well.
F*** David Carradine.