Ever since The Lord of the Rings movie trilogy it seems that filmmakers and studios are attempting to maximize and extend the profits and storytelling capabilities of works of literature. Long books are becoming two part epics, trilogies are becoming quadrilogies, and what was once a bastardized art form of ruining the novel in visual form has become a humongous business model.
Harry Potter, Hunger Games, The Hobbit, and Twilight all have been extended into multiple releases in order to “tell the story.”
However, the fate of some series died on the first attempt: The City of Ember, Lemony Snicket and The Golden Compass come to mind. Other series have been revived a few different ways, such as The Chronicles of Narnia, only to have the marketable stories told (The Lion, The Witch and The Wardrobe; Prince Caspian; The Voyage of the Dawn Treader) and leaving the rest to the imagination of the reader.
Hollywood, stop milking the trilogy for the sake of profit. Everything that is in a novel will not translate to the silver screen. Especially glitter.