#IPv6 support for services doesn't appear to have changed in the last decade. ISPs may have deployed it in the plumbing but that hasn't translated to services.
Domain name service does best because only one name server needs to be reachable via IPv6 to pass the test and a number of domains use a 3rd party that supports IPv6. Mail delivery and Web site have been largely static for a decade. #DNSSEC is even worse than IPv6 and I suspect that DANE wouldn't be noticeable.
