How does everybody feel these days up at the Chateaux? -Cognitively speaking?
Cognitively, I'd say pretty darn good. Everyone has the occasional bout of brain fuzziness, but it usually doesn't last long.
Personally, I can still read. Sometimes, it's actually a relief to read a book!
Video is great, but there are two main problems: There are way too many of them, and I think many people go for what agrees with what they already think. Then YT feeds them more of the same (within Google's Idiocracy boundaries, of course).
Even the most popular "Intellectual Dark Web" shows leave a lot to be desired, and that seems to be what most people are watching. Many of them have their own slants on things, and appeal to people especially because they involve an emotional investment in one direction or another (left, right, Russia is Evil, whatever). It quickly became Same Song, Different Verse.
When you think about it, there is no substitute for reading in terms of knowledge input.
I can watch 1000 videos on how to program in some language, but ultimately, I need to read: explanations, how-tos, API documentation, etc.
Video is sort of like Information Input Lite because there is less of a focus on the actual information, and more of a focus on visuals, sound, and so on.
That's not to say that some videos aren't packed with info, but generally speaking, I think it's all part of the dumbing down of the population.