James Cameron plans three more Avatar sequels.
The director hints at the possibility of sixth and seventh films.
Cameron also wonders if he'll make any non-Avatar films.
"Sprawling" Avatar universe allows him to tell any type of story.
He expresses regret at not being able to make other stories.
As of now, Cameron has collaborated with other filmmakers in the past.
Avatar 3 completed principal photography and some scenes were filmed for Avatar 4.
Avatar 5 has yet to begin filming.