system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: James Cameron is delusional about Avatar

Some news about Avatar 4 & 5 going into production are popping around and I just don't get it, we only saw one movie 10 years ago and it was mediocre.  
We are talking about the director of Terminator, Aliens, Titanic among other masterpieces. A guy who seems to know what he is doing. A guy who went down the Mariana trench because he enjoys pushing boundaries.

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He wanted his own saga, I get it. He wanted a technological breakthrough, he kinda succeed on this one, but the rest did not reach the expectations, it was just an ok movie that I barely remember. Yes it became the highest grossing movie, so I understand why Hollywood is pushing more of it, but I don't get why Cameron is willing to dedicate 2 decades on this project.
gpt
Simply: He has a vision. He is inspired by it. You cannot write 4 movies if you don't. If you had to (for say financial or contract reasons), you would stop after 3, and wouldn't do another two more. He has something to tell and he is excited about it. 

We don't know what that is. Maybe his vision is not as good as he think it is. But for a filmmaker such as Cameron to devote ten years of his life to this one saga, tells that he feels it is important and worth telling.

In this situation, you just gotta have patience. We cannot know what his vision is until he is ready to reveal it (or leaks happen). You can trust Cameron for now, or judge by what you see when you see it.