Colors in movies and TV: What happened to them?
The Lord of the Rings theory appeals to me, not because I think it's right, but because those movies set much else in motion that has plagued film since. For one: fight scenes. The constant cuts from close-up to close-up of the faces of those fighting did an absolutely terrible job of getting the combat across, whether the scale, the difficulty, or what was even logically happening. Many of the fight scenes in movies since have focused on the up-close, refusing to use the vast expanse of the movie screen to do what it's built to do — show large-scale action, give a sense of where this is happening in the world, and showing the characters as being a small part of that world instead of, well, giant faces grimly emoting.