As someone who only got a colour tv in high school and enjoyed monochrome monitors from 1984 until 1995, let me add to the anecdotal evidence that “going grey” does actually make screen interaction less seductive.
My phone was set on greyscale for ages and when I had to change it to colour (to easily distinguish whether messages were being sent as texts or as data) I really noticed how much more I wanted to look at the damn thing.
