If for some silly reason I wanted my fridge internet enabled, I would NAT it behind a firewall.
If you have a properly configured firewall, what benefit is NAT getting you? Most people who are saying this are saying, "I don't need a firewall because I have NAT". Security is a side-effect of NAT, not its purpose.
Does anyone actually have a compelling reason to use IPv6 anywhere.?
Have you ever had to statically map a port on a firewall? Enabled uPNP on a router? Why just this weekend I was trying to VoIP chat with a friend on Retroshare and we spent nearly an hour getting this straightened out. That all goes away with IPv6 (not that my local ISP's even offer it...).