maybe, but what would you need more than "IPv6 then IPv4"?At least, I know there is a motivation for smooth transition to IPv6, such as, IPv4 only -> IPv4 and IPv6 with lower preference -> IPv4 and IPv6 with higher preference -> IPv6 only.you are assuming that you are watching everything over from the sky, high above, like god. that is not how we made largely-distributed system, the Internet, work.
I guess you misunderstood what I mean ? I'm not looking down from the sky. I'm looking at a small part at the edge of the Internet. A small company want to move to ipv6 and want to minimize troubles and risks. Then they want to transition to IPv6 in the way I described above.
Another case may be a network administrator knows that the quality of IPv6 connectivity is clearly worse than that of IPv4 because of tunneling or something.you just have to switch to better IPv6 provider.
So, give me money please ;) I guess not so many company can have good-quality ipv6 connectibity from the start.