Since there is no compatiblity between ipv4 and ipv6, the later will never be adobpted and the internet will die because the world will not all upgrade at the exact same time and the exact same moment, day, week, month year.
Obviously ipv6 IS going to be adopted and the net WON'T die.
Something is missing in the discussion beyond dual stack. Maybe DNS cubed (squared?)
As far as hotspotsystem is related: When is the drop dead ETA for ipv4 and ETA for full ipv6 to be implemented? Hotspotsystem needs to be ready well before those dates indeed and it ain't this or next year and I bet not for another 3 (to maybe 8) years.
BUT, I don't know and I would like to know what is the missing part in the migration as well.
😉 Never mind 12-21-12 is coming first anyway. 😉