Have no idea what happened there.........
They have completely ruined the chance to make anymore of the films. That said, I did enjoy the film - the nods to Jaws are quite sweet.
The other series of books that would have been great, had they not screwed up the first one, is The inheritance Cycle by Christopher Paolini.
The first books, Eragon, was written by Christopher when he was 15 years old. The film company swooped in and brought the rights and despite Christopher telling then that the story would be continuing, they rushed the first film out. As a compromise, and to increase their profits. The film company agreed to add the scene at the end showing a second dragon - all good, so they thought and buy the options to any other books.
The second book got finished and the film company realised how badly they had shot themselves in the foot. There was no way they could continue because of major errors within the first film.
They now own the rights to four books, which if done properly, they could have had another really good film franchise in their collection.
All because the powers that be didn't have faith "in a 15 year old kid, who caused a bit of a stir with his first book".