I would never suggest making a film out of the Dragon Reborn series or Conan series. Whenever books are made into movies a lot of the content is cut + when one is reading a book, they use their mind to visualize the situation and characters. In a film, they would ruin anyone's individual perception of the books. A book-made-movie would put a stain on the good series.
+ with all the drama going on in the towers (not action), the movie would itself be boring.