Sorry, while I have a lot of the Graham essays, hopefully all them, now also including this one, here I nearly fully disagree with Graham:
(1) Due to computer-based word processing and spelling and grammar correction, writing, and good writing, are much easier now than before personal computers (PC). Indeed, a quip is that the typewriters killed off the ink pens, and the PCs killed off the typewriters; writing got easier and likely better, not less common. People got a lot more practice.
(2) Email, Internet blog posts, and other communications generate more writing. Can we find some data on total US email volume and compare that with old USPS mail volume, letters to the editor of newspapers, etc.?
(3) Now there is a lot of competition for good writing: At Hacker News, bad writing, especially from bad thinking, gets down voted. On Web sites using Disqus, part of getting voted up is clear, short, maybe just one sentence, maybe sarcastic, clever, and humorous, say, succinct, on the point, and maybe fun, and that means in some respects better writing. Maybe Disqus could tell us how Internet blog post writing volume has increased? A lot?
(4) For the media, via the Internet and Web sites, that is now much cheaper to produce than old newspapers, magazines, TV news, and I'd guess that the total of media as writing or as oral reading of what was written is much greater than before. For the future, I anticipate many more words per day, i.e., more writing. Uh, the writing at Hacker News has been going down, up, or staying the same? There is Facebook, X, Reddit, Wikipedia. There are sites for narrow interests. Sounds like a lot more writing.
(5) People have smart phones with them nearly all the time; net, that can mean more communications, and writing is less intrusive on the receiver than in-person voice. From good STEM field communications or just mature socialization, to avoid being misunderstood or offensive, good writing is important.
(6) Sure, now some Google searches result in AI answers, and for some simple questions the AI answers can be a little okay. But, I don't take the AI answers seriously, and the old Google search facility works fine and, also, of high importance, gives the URLs for the search results.
(7) Looking back at my writing, from personal letters to academics, on-line political discussions, etc., I see no way AI could help -- the AI writing is worse, not better.
(8) Since supposedly Taylor Swift is now worth $1.6 billion, there can be increased interest in guitar playing and the claim that such music is based almost entirely on the four chords I, IV, V, and VI. So, my niece wanted to know, and I wrote her an essay, 6,200 words with several YouTube URLs with pictures and sound. For some music with a lot of chords included URL
https://www.youtube.com/watch?v=UZsqnHhyub0
Sorry, but for my niece I found nothing nearly as good as what I wrote and believe that AI would be a poor substitute.
(9) The world is changing, especially related to writing, at likely a uniquely high rate, and no AI training data can report today what is new tomorrow and needs good writing.