This posting instead is about movies that were never completed, or in some cases never filmed at all. Every filmmaker has a list of projects that just didn’t work out. Either they couldn’t find financing, or schedules were too complicated, or situations suddenly changed.
Directors and other creative personnel invested a lot of time and money into the five films below.
Why won't this one be made? He is still making movies...occasionally in between being a foul mouthed artist....
Blame Twilight. Movie companies now operate under the assumption that a horror movie won't be successful unless it's actually a melodramatic PG-13 romance geared towards an audience who has never seen a proper horror movie (i.e. teenage girls). So, once the big movie companies figured out that At The Mountains Of Madness was going to be a hard R and that Shoggoths were not brooding teenage boys seducing equally brooding teenage girls, they refused to touch the project with a 20ft pole. So, Guillermo del Toro and James Cameron put the project on hiatus and went about their separate ways. Guillermo del Toro went on to make Pacific Rim (which is going to be awesome) and James Cameron is turning Avatar into a trilogy (no comment).