A percentage can't double indefinitely. There is an upper bound. You'd need to look at the raw number of hosts supporting IPv6, rather than the percentage, to d

A percentage can't double indefinitely. There is an upper bound. You'd need to look at the raw number of hosts supporting IPv6, rather than the percentage, to decide how fast it is doubling. I don't see the raw numbers on this site, so we can't say from this information.