[thisisabore]

I really think you have got a point, I'd add however that reading is more cognitive effort than watching a video, at a basic level (that is, information in the text or video put aside).

Just see how hard it is to read more than a few paragraphs when tired before bed vs. how hard it is to watch something in the same state.

I think this gets added to the point you are making about reading skills declining.