In all seriousness, I don't know how they're going to deal with people with legacy devices, which may not be upgradable to IPv6 compatible.
Yes, that is exactly why there was a (completely ignored, of course) warning about 7 years ago that is last moment to start implementing IPv6 in devices, so that when 2010 came, all legacy IPv4-only devices would be dead.
But did they listen? Noooo... But that is not the end of the world. People will just buy more new IPv6 enabled equipment than they would normally and throw away their old stuff (we all love this consumerist society, yes?), and we'll be running IPv4+IPv6 for some time before IPv4-only sites start to become unreachable without hacks anyway.
But due to ignoring the problem for the last decade, there *will* be some pain and expenses which could've easily been avoided. For example, if companies started demanding 8 years ago that all new routers/etc they buy must be IPv6 enabled, all their old stuff would be replaced by now with no additional expense. As they didn't, they'll have to shell out some extra monies and upgrade their hardware much sooner than their useful life is over.
Maybe that will teach companies to listen to techies in the future (yeah, right)