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Yes, eventually everything will migrate to IPv6. It'll be a slow process. There are already people answering IPv6 requests on the net. Get on EFnet and you'll spot people on IRC from v6 addys.
IPv4 has 2^32 address space, but due to how IP's were classed in the early days (Class A, Class B, Class C, etc) and handed out (Purdue, MIT, Apple, etc have Class A's, or 1/255th of the internet IP space) the number space has been exhausted rather quickly.
Steps by ARIN in the last couple years to ensure that IP's which are handed out are in use, as well as the switch to classless routing and reappropriation of IP blocks under 127 has helped.
If you install a FreeBSD box, it prefers IPv6 and falls back to IPv4 by default.
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