A Swiss VM hosting provider has a technical blog post about how to kill IPv4 completely on FreeBSD. That is to say, turning it completely off, not just preferring IPv6. They then solicit concrete solutions describing, along with a proof of concept, how to turn IPv4 completely off in other operating systems and allowing them to communicate with IPv6 only.
Earlier on SN:
Vint Cerf's Dream Do-Over: 2 Ways He'd Make the Internet Different (2016)
You have IPv6. Turn it on. (2016)
We've Killed IPv4! (2014)
(Score: 2) by NotSanguine on Saturday January 19 2019, @01:41AM
Geez, Louise! We already have the evil bit [ietf.org]. What more do you want?*
*Your in[s]anity doesn't deserve a serious response. So this is what you get.
No, no, you're not thinking; you're just being logical. --Niels Bohr