When I first heard about RENO 911!, I sincerely doubted the series would work. Mockumentaries are tricky to execute as theatrical one-offs - the idea of realizing the genre on a regular, weekly basis seemed the height of folly to me (although, I suppose it's really more of a riff on "reality" shows).
But it proved me wrong. The series has enjoyed a reasonable amount of success and is surprisingly consistent; I like it. And, early next year, the concept is being ported to theaters - which also seems like a bad idea at face value. But, if they did it once, maybe they can do it again? Theoretically, of course.