The reason for lack of IPv6 adopton
There is a reason for lack of IPv6 adoption. The ISP of the world don't bother with setting up IPv6 service because they claim there is no need for it. This is utter and total bullshit. This also goes for many ISP in Europe. I complained about lack of IPv6 with my ISP in Denmark (Stofa) and they told me that there was no need for it. Even if it is clear that IPv6 is a lot better in dealing with fast internet connection that they are selling (above 50Mbps speeds).
When I have used IPv6 it is clear that websites like YouTube are considerably faster to load videos than when I use IPv4 only (that is 99% of all time so far). There is also a speed element in this that nobody doesn't seems to be consider.