In any case, that is kindof the important number, as it reflects the availability of IPv6 connectivity on end user devices, so it's the revelant number for deciding when you can drop IPv4 on the server. Once it's high enough, we can start removing all the IPv4 cruft--it doesn't really matter whether other sites are still running on v4-only.

Ok, we've attempted to make the title more accurate, and also changed the URL from http://www.circleid.com/posts/20160821_ipv6_now_dominant_pro..., which points to this.

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IPv6 enabled hosts include Google and Facebook, so I'd guess that's a lot of traffic.

I think you misread the announcement. To me it reads that >50% of the total traffic is now coming via IPv6 from IPv6-capable content providers ('FaceTubeFlix').

Yup. I was about to arc up with an Amazon AWS rant until I read that almost-last-sentence. Headline is misleading, article doesn't ever really clarify, just throws that hint in at the end...

(I've got precisely zero mobile apps in the AppStore or Google Play that use IPv6 to talk to their backends...)

I'm not sure the distinction is likely to matter. A small number of sites which account for a significant chunk of all traffic, and many of those sites are compatible with non-legacy internet protocols.