If they made a movie it would probably go under the huge mass of films that are vomited out on regular basis, especially if they mess it up.
Most movie adaptations from books do exactly what hexdrex said and will probably not get the desired publicy for the books.
If there was an anime... not many people are interested in anime, many even consider it childish and overdone, so that probably wouldn't work either.
I wonder what would happen if they made a cartoon out of it, or a 3D movie? the problem would, of course, be quality (please, nothing in the style of 'fairly odd parents' or stuff like that!) and keeping the tone of the books (meaning, that they don't water down strong themes etc.)
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