At this point I'm personally convinced that ipv6 is a failed technology. It used to be interesting to see the news about new ipv6 deployments, adoption ratings etc. Now I basically don't care.
IPv6 has been mature for over 15 years and is slowly making its way. Most major LTE carriers have deployed it, most home broadband providers have the infra in place, they're just waiting to flip the switch. We're in the boring, uneventful, slow deployment phase.