I read that younger people have no concept of files or filesystems.

"Just search baby!"

And now "someone else's database"

Books are essentially files (chapters) bound together by being coherent, consistent, aligned and building upon each other. This is not something you want to see go away. I have used "The Internet of Unconnected Bytes" for too long.

Putting things together in interesting and valuable ways is a creative act. Files are that way.

Applesauce isn't.

I'm not really sure I agree entirely with the premise that plaintext files are going away or becoming less prevalent. I tend to do a lot with plain text files myself, but maybe you're right, maybe I'm kind of old :)