I understand that the changeover from 4 to 6 has to be gradual, and I suppose the fact that all the new cellphones are using IPv6 is significant. Still, I wonder if we will ever be able to shut off IPv4 in home installations -- or on phones. Realistically, we can't do it until every server out there supports IPv6.
With Comcast service, I am now fully dual stack, and it's nice to see more of my traffic using IPv6. But there have to be extra overhead and security issues when running two IP systems compared to pure IPv6. Many or most of the services I use are still IPv4 only, e.g. Slashdot.