While new IPv4 public addresses have been disappearing, more and more IPv6 is being deployed and carrying real traffic on the Internet.
Several countries are at or close to 50% now. The Internet “core” is close to 80% migrated. 56% of global content is now moving over IPv6 (that could already be considered the “tipping point”). About 32% of the users in the world now are using IPv6. When this statistic reaches 50%, it will definitely be a tipping point.
You can find this applet at www.ipv6forum.org. It is frequently updated by Cisco.
So how many people total are using the Internet today? About 3.88 billion. For the breakdown, see here. So some 1.24 billion people are using IPv6 today. That’s a big market. And it’s growing rapidly.
The following graph shows what percentage of people are connecting to www.google.com over IPv6:
This is in spite of a recent “innovation” in browsers called “Happy Eyeballs” that can still choose to use IPv4 even if both your node and the website you are accessing are dual stack. The RFCs say in that case IPv6 should be used. Due to some early problem with “broken IPv6” the Happy Eyeballs algorithm was implemented in browsers. The problems are no longer there, but the algorithm still is.
The situation on mobile in the U.S. is quite different. Facebook and Akamai recently announced that more than half of the network connections from mobile nodes were over IPv6. The telcos have been aggressively deploying IPv6 there on mobile. The rest of the world will soon catch up in this area. U.S. telcos have discovered it is simpler and cheaper to deploy IPv6 than to try to keep IPv4 alive one more desperate year.