[TheDong]

> ensure you can support it with a software update if you don't support it

For hardware, that doesn't sound that different from not supporting it. Convincing end-users of internet hardware to update their switch's firmware is hard. Ubiquiti has done a pretty good job of making updates actually doable, but for most hardware I doubt it'd happen more quickly than the hardware itself would fail.

> That isn't to say IPv6 couldn't have been done in a backward compatible way. I can think of ways to do that

Can you explain any of those ways?