The answer is that they're still very much out there, but that American audiences hear so little about them. This piece by Anthony Kaufman in the New York Times helps explain why foreign filmmakers are becoming an endangered species on U.S. screens. The culprits range from lack of media attention to the competition for art-house space, but here's a succinct summation from the head of a small distribution company:
"I feel as if there's almost no auteur draw anymore. As opposed to 20 years ago, you were marketing the movies around the filmmaker -- Fassbinder's new film, Godard's new film. We still do it, but the honest truth is that the filmmaker matters increasingly little today."Which I think is very true and really sad.
(Note: Part Two of this thread is here.)