How far below is the question. It could level out at 60% - that is believable. However it can't level out at 99% - Somewhere around 95% major sites will decide IPv4 isn't worth supporting and they will just ignore that final 5% of customers, which will force them to upgrade - which in turn will give others confidence to remove their final 4% of customers - until IPv4 dies.

There are still ascii dialup bulletin boards out there. and operating model T’s. IPv4 will be around for longer than you or I.

There are also still Telex and X.25 networks around there, not to forget the whole public telephone network!

But at some point, getting a native connection to all of these started becoming increasingly rare, and now these are largely emulated/tunneled on top of IP. The same can happen for IPv4.

> IPv4 will be around for longer than you or I.

That's a matter for the legacy network on the other side of the internet to handle, as it converts my IPv6 packets to IPv4.

That’s indeed what they’re saying, but they’re simply wrong which is obvious from looking at the graph and accounting for seasonal variation.