But a movie is a different medium than a book. Sure, they are both stories, but you can't just interchange actors for actors even if you play the movie scene by scene (Psycho I'm looking in your direction.) The actors and original shots are an entegral part of the story.
1976 the Star Wars book met with lackluster sales, but after the movie, the book was on the top 10.
Remaking classics is a horrible, horrible idea. Gone with the Wind, Wizard of Oz, Casablanca. Could you imagine those...remade? (And I don't meen "blackification" that was done with "The Wiz" or Family Guy' "Black to the Future." That is just plain sacrilige.)