It's ridiculous to say there is no plan B. Plan B has been in place and has been slowing the use of IPv4 addresses for years: Network Address Translation
If you have a home network, in all likelihood your computers do not have unique external IP addresses, just your router. Even if for some reason IPv6 was never rolled out, this would just be implemented on a larger scale--your neighborhood may get a single unique IP.
I would obviously prefer widespread IPv6 adoption, but implying chaos otherwise is just ridiculous. It would just make things a bit more painful.
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If you have a home network, in all likelihood your computers do not have unique external IP addresses, just your router. Even if for some reason IPv6 was never rolled out, this would just be implemented on a larger scale--your neighborhood may get a single unique IP.
I would obviously prefer widespread IPv6 adoption, but implying chaos otherwise is just ridiculous. It would just make things a bit more painful.