I think this can be pretty much summed up along the lines of: way back when colour was introduced into film people wanted to show it off more, it was something magical whereas now everyone wants to be all edgy and gritty.
Or.... it's the lizard people controlling the world and making everyone miserable by using only dark grim colours?!
Or.... it's the lizard people controlling the world and making everyone miserable by using only dark grim colours?!