Where are you getting that from? Looking at public IPv6 statistics from big companies shows that it's going up. Google's shows a 4.5% increase in IPv6 of total traffic during the past year[0]. Facebook's shows a 6% increase and at 55% for the US [1]. Meanwhile Mexico went from 5% IPv6 to 25% this year [2].
[0]: https://www.google.com/intl/en/ipv6/statistics.html [1]: https://www.facebook.com/ipv6/?tab=ipv6 [2]: https://www.vyncke.org/ipv6status/project.php?metric=p&timef...