Maybe for simple things. Have you ever tried to plaster a wall or ceiling? You can watch 100 videos of how its done, if you don't have the motor skills and muscle memories it's not so easy. And even 'simple' DIY might be doable for a sample of the population but there are also people who struggle with putting together flat pack furniture. Are they going to be brazing their plumbing after watching a youtube video?

Personally, I see society going in the opposite direction.

Back in the 1980s there were a lot more jobs in manufacturing, doing things like manual machining; and every driver had to have basic mechanic's skills because cars needed constant tinkering.

We've got many more youtube videos showing how to use a hacksaw - but far fewer people who use hacksaws on a daily basis.

I love all the downvotes for something that is definitely going to happen. YouTube how-to videos are just the beginning.

Just beginning... since 1979.

https://m.youtube.com/c/thisoldhouse

On-demand makes a huge difference. Most people aren't going to memorize how to fix everything that might go wrong. Youtube lets you search for how to fix something when it breaks.

Like a library?

Like a library with free video that's in your pocket and open 24/7. You don't think that makes a little bit of difference to the practicalities of what happens when e.g. your boiler stops working one evening?