What happened to avatar?

Avatar the last airbender theme was released in 2006 and only came out with two sets. I am wondering why it didn't prosper. If it was released this coming year, and was based off of both the movie and the TV series, it would probably stay for another 3 years. Possibly, you could make a video game of Lego avatar: the last airbender. What is your opinion, and your ideas for sets?