By some odd turn of events, James Cameron was in Brazil to promote the DVD release of "Avatar," and this happened:

People liked the movie because "Nature," as described entirely by computers, was a lush, romantic, fascinating place with humanoids that appealed to people who go to conventions dressed up as Sailor Moon or sexy versions of Sonic the Hedgehog. That's fine; it's no stranger than being a Star Trek geek, aside from the minor part about humans being the good guys in Trek.

If Cameron wants to help the tribes, fine, but this smacks of George Lucas sitting down with the owners of a struggling Build-A-Bear store and asking how he can save their franchise, drawing on his rich experience with Ewoks. Avatar was a movie, and unless the Amazon natives can plug their heads into dragons; bodies, fly around and pick up construction equipment, this won't end well. But by then Cameron will be on to something else.