I don't see the point in making sequels to Avatar anymore. It was a really popular movie for a brief period of time in 2010, and then by the time 2011 rolled around, everyone forgot about it. Even the spergs don't care for it anymore. That's how mediocre and forgettable it is.
Aside from the whole brief fad following it had in early 2010, and the fact there was those box office sales records it set, it's really a forgettable movie. Honestly, I think more people will remember its sales figures than the movie itself except maybe as a minor footnote of the late 2000's/early 2010's 3D fad.