You're right. I have a number of books, even a series or two that I'd love to see made into great movies. That is my worry though too. I'm afraid Hollywood would take a great story, full of imagery, character, and values...and apply their "formula" to it. The scenes would be stylized, the characters shallow and easily digestible, the values and morals in the story distorted beyond recognition (even reversed) to conform to current Hollywood fashion.
As much as I'd like to see some of my favorite stories made into movies, I am very, very afraid of what Hollywood would do to them.
You detailed, perfectly, what Hollyweird did to World War Z (that would have made a great TV show ... Far too much material for a movie).