Since it appears that Avatar is a representation of the American Indians in the US then the plot for the next film makes since and is obvious on how it will go. It will show the Red Navi being very aggressive to the Humans and this will be something that is sent to earth to give the impression of how savage the Navi are so reinforcements will be poured to tame them. I am getting a feeling that the conclusion to this series will be another tragedy film.