Just like IPX. It's still necessary and in use for some things -- so it hasn't reached its end of life -- but when was the last time you ever thought about it?

By this metric, we still haven't finished migrating to v4.

True. I could see a world where IPv4 is only for legacy, internal systems and it is not routed externally, but that feels like decades away. There would need to be a coordinated effort of major ISPs to turn it off, but why would that happen if people are willing to pay for it?

I'm curious: what still uses IPX in 2022?

Red Alert 2! They never added IP-based LAN play to it.

I have no doubt there's an internal application running on a Novell server somewhere that we'll never hear about. It's still running on a machine in a closet just like it was in 1997, or possibly imaged and migrated to a VM because nobody wanted to touch it.