[fizzynut]

I'm curious why you think Javascript should be on the list, I see a lot of issues:

Javascript generally runs on a website in a browser: The browser must be continually updated on the client side every few weeks at the very least.

Your software must work on all future browsers in 50 years time.

Security patches/privacy/laws/etc deprecate/change API calls regularly.

The website must continually update certificates, maintain payments to providers / keep valid credentials / not get hacked for 50 years.

Most javascript applications have a billion dependencies, and people rewrite using a new framework over updating if it's been a few years, never mind decades.

Keeping dependencies up to date for 50 years is a lot of work.

I don't know of any instances of anything javascript that has run continually for 20 years to date?