Yeah, I think that would be a cool idea. There is certainly enough material out there to grab a great story for a movie. Sadly though you'de probably end up with massive amounts of cheese and the movie would be geared at the kiddies, because of course the mass media would have you believe that kids are the only people who enjoy games like that. Adults are supposed to be working on their lawns or fixing their house or (better yet for them) watching TV in their leasure time.
Just be prepared for the cute little goblin comic-releaf character who can never shoot cuz his gun is jammed then he has to throw a rock but it bounces off something and comes back and hits him in the head, then he falls down and the gun goes off.
