@kimonostereo This is a very good question.
I saw this very thing happen just this year. A lit/poetry blogger I had followed for years fell silent. There had been some entries obliquely referring to his health, but it was only after some sleuthing last year that I found an obit online. He had died of cancer in late 2016.
Then, a few months ago, some new posts showed up in my RSS feed. His domain had lapsed. Someone else had bought it and set up a blog talking about IoT in Japanese. His blog of 15+ years, all about mindfulness, Buddhism, poetry. Gone.
I suppose it’s possible to set up something like, I don't know, a small foundation through your estate that could continue to pay hosting fees; or you could will the domain to an heir, directing them to at least archive the contents of your site… So a related question is: who inherits your passwords?
We should all be putting some thought to this.