There are a couple of discussions about this in the message boards at the bottom of the IMDB page. Apparently somebody still thought that Esperanto was going to take off, though it was said at the time that the movie would be screened for 300 people in NYC and 200 people in Chicago and that would be that.

That discussion led on to another one about Esperanto itself. Allegedly there are about 1m Esperanto speakers around (and I know that there's an Esperanto Wikipedia). One poster was actually learning the language himself (but didn't know why!).

Worth a look. I think you have to register in order to use the message boards (just as you have to do here).