I've heard a lot of negative comments over the last two years of certain books and stories being adapted into films. A lot of the times the plots are different from the original source material and people use that to decide that the films are no good. That isn't always the case though. Let me show you some examples of films adapted from stories that did very well.
One thing we could possibly look at with film adaptations of books and stories is if they capture the spirit of the original tales or not. That was how the author of How to Train Your Dragon, Cressida Cowell, looked at the film of her book. Diana Wynne Jones knew that the adaptation of Howl's Moving Castle, yet she was okay with that. I've been thinking that maybe we go to the movies expecting to see the books. Maybe we shouldn't. There probably comes a time when a story will need to be re-imagined. After all the original fairy tales we grew up with were edited and changed because the original versions could get pretty dark and graphic. I doubt parents would allow children to read or see a Cinderella story where the stepsisters cut off their heels to try and make the slipper fit. Maybe one of the keys to re-imagining a story is to stay true to the spirit it had. The time will come when we will need to re-imagine our stories. If not they will most likely not survive to entertain the next generation.