My understanding is it would be hard/impossible to get everyone to IPv6 at this point because there will always be a long tail of devices that aren't there yet,

My understanding is it would be hard/impossible to get everyone to IPv6 at this point because there will always be a long tail of devices that aren't there yet, and we can't just jettison those from the internet But yeah, I think even if everything magically changed to v6 overnight, we'd still be stuck with NAT to a large extent because so much is tangled up in it at this point. For one, it probably makes it easier for ISPs to bill their customers. Especially the dynamic-IP side of things.