Re: failed, not
So v6 can continue to grow at that rate
This is a dumb assumption. I think the only safe thing you can say about IPv6 adoption is that it will be erratic. Some carriers and countries will adopt wholesale while others avoid it. At some point there is likely to be an (or many) inflection point where adoption picks up significantly. This could be for technological (end of the road for NAT), regulatory, or financial (it becomes cheaper to run only IPv6 kit), but the important thing is minimal disruption to users.