Interesting point...maybe he or she was thinking of it from Dyn's perspective of remote access. Each of those devices probably connect to a hostname with their own IP (using port forwarding) or something. Good point though..the second half of the graphic is what I thought was interesting. The breakdown per region is pretty interesting. It's hard to imagine that years ago people they didn't expect this to happen.
They realised this was an issue in the 1980s, back when it wasn't even clear that the internet would spread into a general usage network (rather than military/academic).
It took until 1995 to get agreement on what IPv6 would look like - but that's still 18 years ago. Plenty of time for a phased changeover :->