The problem is, I can't think of any directors who would be willing to even touch this franchise after Bay has already "left his mark" all over it. It would have to be someone who knows how to do good, visually impressive action sequences, but knows when to reign things in if need be(unlike Bay, who seems to fly off the handle and go wild, if he doesn't have a producer or someone to watch over him). It would also have to be someone who could respect the source material and the Transformers lore and not simply use it for the sake of creating tons of explosions with a weak storyline. They also need to be able to give ample screen time and character development for the robots themselves, so the movie won't be just ""HUMANS!: also featuring some transforming robots". Maybe James Cameron(with someone else writing the script)could be a possibility. If only he wasn't busy working on "Dances With Smurfy Cats" 2 and 3, lol.