EDIT: TO make this perfectly clear, lomography as an art form was around before Lomography the company was.
I'm not really going to say poo to *anyone* who makes new film cameras. I mean, you could actually say the same about the new Fuji folder and the new Voigtlander rangefinders: they cause people to buy new cameras instead of the older ones that are just as good.
The thing is: they're not keeping anyone from buying used cameras. It all started out with people buying cheap cameras on Ebay and learning that, hey, this is pretty cool. In fact, used cameras are becoming more and more popular, and not to mention prices are going up on some of the best ones, including the Nikon and Canon bodies.
As to the whole 'environment' thing, developing film isn't really all that great for it, either, especially in large amounts. So...that entire point is moot.