I just see a Hollywood that ran out of ideas a long time ago and is desperate for a fresh story. The big movie pushes I've seen this year are John Carter, based on a character that first appeared a hundred years ago, and the Hunger Games, based on a book series that first appeared less than four years ago. Then I see a new Three Stooges film coming out that, among other crazy things, features an appearance of several…
The reason most Hollywood material is adapted material, is that a movie is a hell of an expensive place to try out new ideas. A book costs little to write, and takes one person to write it. And there are lots of them, succeeding, or failing, on the strength of their ideas, writing and storytelling. Cinema has never been the place to run a lot of flags up the pole and see which one the public salutes.