Unfortunately the LLMs are trained on what we've made, and there's going to be a ton more React garbage[1] in the training set than there are carefully-crafted websites like the article describes, so I don't expect a decrease in overengineered, bloated junk. If anything, I predict that the fact that you can shit one out in less time than before will have a different effect: A modest increase in bloat since an LLM won't mind adding a half dozen redundant and competing ways to do the same things in a large codebase, combined with a shorter mean-time-between-full-rewrites.

I think most of us have seen incredibly creaky codebases that are too buggy to be maintained any longer, where we make the hard choice to wipe the slate clean and build a new one.

We might find those rewrites happening every 12-24 months instead of after a decade.

[1] Frontend people, I mean no disrespect -- just that React & friends are (ab)used for nearly every website now, even those which map perfectly onto the "Simple document viewing with occasional submission of incredibly simple form data" model that plain HTML has always been perfect for.