The better question, for an isp, is what kind of ipv4 secondary market budget do you have? How hot is your cgn running? Like ALGs much ? Security and attribute much ?
These are important, yes.
Again , users dont care or know about v4 or v6. This is purely a network operator and app issue (cough cough ... skype).
It's my contention that IPv6 won't be widely deployed unless/until end-customers call up their ISPs demanding this 'IPv6 or whatever' thing they need to accomplish some goal they have.
There are two basic value propositions: IPv6 is better, or IPv6 is cheaper. You argue that it must be better. I presented my argument in Dallas, that IPv6 will be cheaper than IPv4 when ISPs' costs to expand an IPv4 network rise. Some ISPs will, no doubt, raise prices for IPv4 service. Then IPv6 will be in demand. We can even express this now to app developers and consumer electronics makers: "Don't let your app/device be the one that costs your customer extra dollars every month. Especially if your competitor's app/device does support IPv6." There are significant deployments of residential IPv6 now. http://www.worldipv6launch.org/measurements/ I'm not expecting content over IPv6 just yet (unless it's a pre-release publicity stunt). I do expect some ISP in the next two years to offer an IPv6-only service at a discount to dual-stack. Lee