Well, IPv4 addresses. I think that this time it's for sure. Maybe.
It doesn't look like it's making much - or any - difference. For sure, nobody wants to run IPv6 - no doubt that most vendors "support" IPv6 only if you also run IPv4. And at no time do their fingers leave their hands ...
The good news is that if everyone had to switch to IPv6, it would probably go decently well. Sure a few things would break but they'd get fixed toute suite. I mean, it's the Internet. You bet they'd fix it.
The whole thing has been billed as an Earth Shattering Kaboom but has turned out to be a damp firecracker.