I think this is defeatist talk where it’s not warranted. I remember IPX networks in the 90s were still a thing because people believed they could eke out a little more performance for their games. It’s taking a long time to move to IPv6 in some parts of the world. eg: anyone who doesn’t feel the pain of the IPv4 address crunch likely due to having a large chunk to begin with. Many influential organizations in North America definitely fall in that category.

IPv6 is a success IMHO because it is used in so many places. Google’s IPv6 traffic graph shows close to 50% adoption and still trending up. We can’t possibly expect the world to be near 100% overnight… the internet is a big place with the whole spectrum of humans influencing IT; There will always be someone who will cling to IPv4 for dear life.