I'm pretty sure there were a lot of movies in 3D out before Avatar, and a lot of them were successful. There were 9 movies released in the same 3D format in 2009 before Avatar, and then that number nearly tripled in 2010. You can't say that Avatar was the cause of that, unless Hollywood has gotten insanely fast at churning out movies. I'm sure most of the movies released this year were in production long before Avatar released. Avatar may have been the largest 3D release for 2009, but that can be attributed to the fact that only about 1000 3D theaters existed prior to its release, and now the theaters and televisions are widely available and cheaper.