IPv4 address exhaustion will never occur.
Yes, it would be interesting to see the justification needed in order to be assigned the last remaining IPv4 address. :-)
And obviously at some point people are going to stop throwing around subnets but tunnel individual IPv4 addresses (possibly over IPv6) so each and every address can be made useful.
[...]
The question(s) that raises are "will <pick a point in that game plan> ever occur, and if so, when?"
My crystal ball is as cloudy as anyone's. But I would expect that it is all a matter of economics.
And we all know economics is just better paid psychology. At some point people are going to act on their expectations of what others are going to do. Look at the DoD move: they are now requiring v6 because they expect the market to pick it up and they don't want to be left behind. The market sees the DoD requires it so they start to pick up IPv6 too...
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