Cameron said he envisioned a trilogy and he said that before Avatar hit theaters. So it isn`t like when they make a standalone movie and than force sequels to a story that`s done. Avatar is a great standalone movie but you can feel that there are many things that can be explored further. Also, he has very good track record with sequels (Aliens, T2) so I doubt he`ll give us more of the same. Of course, anyone can stumble but the sequels are guaranteed to provide at least some never-seen-before technological wonder (like Alien Queen and liquid metal T1000) if not a strong story as well.I love Avatar precisely because it`s so simple and straightforward. I don`t think the movie would have so many detractors if it didn`t end up an oscar nominee. That was when people who loved it started getting cynical and going "oh, Oscar nominee can`t possibly be a simple love story, WTF?"