About the only one that hasn't figured out IPv6 are enterprise & SMB
The carriers have it all down pat, and 65-85% of residential users and wireless users are using IPv6 natively already. Mostly because the CPE can be remotely configured by the carriers to handle what they need.
But when techs have to go configure SMB firewall, they won't bother to learn how to do IPv6, and they only configure the IPv4 side (if their gear even supports dual stack).
Meanwhile, the residential and wireless users are driving most of the content so the content providers provide big fat pipes that can handle their needs.