It means I could maybe publish my memoirs and family tree and have it still available in 500 years.
It also makes web domains like other property - you don't purchase a nice watch and then expect it to be reassigned to someone else if you don't pay your annual watch renewals.
Your property is both relatively scarce, limited, and requires significant service compared to random domains on some random tld.
Everyone would love to have a three- or four-letter domain but, like land, they're not making new characters for the ASCII alphabet.
This usecase makes no sense at all. If you plan to have a server going after you're no longer able to maintain a server, your only option is to pay someone to manage your infrastructure and/or services. Once you're paying some company to manage your infrastructures, managing domains becomes a subitem in your invoice.
To get around the problem of a numeric TLD, I suggest using Roman numerals (and telling Myanmar it has to go back to using .bu).
While I'm sure this would be great for your ego, it makes no actual sense. Very few documents from so long ago are available, not because it was somehow miraculously impossible to preserve documents but because overwhelmingly people don't give a shit.
You are demanding that future people should give a shit, and they aren't going to oblige.
I for one love to read historical documents and primary sources. I'm glad some people in ancient times had the foresight to record a bit of their lives in the hope that future generations might find it interesting.
You always have the option of committing your memoirs to stone, absorbing the long-term cost up front yourself.
I’ve always found personal accounts and memoirs to be the best kind of writing. You get to read beneath the surface between the person they were, the person they wanted to be and the worldly circumstances they found themselves in.
Of course, go far back enough (I'm not sure if 500 years is enough) and mathematically speaking, the number of your ancestors will exceed the population of the world, which shows some other issues that you run into.