Not shifting anything. You have some Joe Sixpack on IPv4 now. He simply cannot use IPv6 network. And why? Because someone decided that he needs a new address, when he's got a perfectly valid one. Or that he needs to "reconfigure" a perfectly good setup for no immediate benefit.
See the sentence in my post you replied to:
> No, his idea is a common sense one: people already connected to the net should not have to reconnect.
I have no idea why people are trying to justify this screwed up plan. It's a bit like Itanic. We'll have this beautiful new CPU, but _all_ application writers will have to optimise software for it when they compile their apps. Brilliant plan. Just like the current reconfiguration of every single working setup out there.