> Constantly showing that nag will put a lot of pressure on major ISPs like Comcast
Comcast is making good progress: http://www.worldipv6launch.org/apps/ipv6week/measurement/ima...
For others, see: http://www.worldipv6launch.org/measurements/
Yes, Comcast has made, relatively speaking, amazing progress on deploying IPv6 across their network. It works very well (well, except if you have one of their business "routers" required if you need a static IPv4 address). This is a stark contrast of, say, Verizon Fios, who has yet to deploy ANY IPv6 across their network.
It doesn't even need to be that drastic. Apple, Google, and Microsoft could just check for IPv6 when connecting to a network. If it's missing, display some kind of alert saying, "This internet connection is malfunctioning, please contact (lookup service number based on the IP address.)"
Constantly showing that nag will put a lot of pressure on major ISPs like Comcast.