> Both things are equivalent: addition of a new feature to your software that none of your customers are going to actually use.
Equivalent? I can't even test IPv6 without obtaining a new address. I could if my IPv4 worked instead. That's why it would get included - it would be actually useful at some point to people _connected_ to the net. In fact, we wouldn't even be talking about the address crunch.
> My router could have added IPv6 support 10 years ago, too, without me knowing it. But it didn't.
Yeah, of course it didn't. Where would you get an IPv6 address from anyway?