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@jwz The time wasted is not in configuring IPv6, but in configuring it in addition to IPv4. IPv6-only is just as easy as IPv4-only (in fact, it's even easier, because you don't need DHCP or that horrible thing called NAT).

So it's okay if you do IPv4 only, it's understandable. When all that's left using IPv4 will be the machines of people who think like you, we’ll can either wait for these machines to disappear and then switch off IPv4 if we’re patient (so you won't have to do anything), or switch it off immediately (in which case you'll only have IPv6 to manage, like you only manage IPv4 today, so it won't be a problem).

The only thing we're asking is that you don't discourage others people from doing it: it'll only waste more time, having to deal with duplicate conf for longer, and especially if you convince beginners, it could delay the deadline by at least a generation, which would be really annoying.