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One way would be that it would help identify individuals better since giant NATs will not be as popular. For example, I believe some IBM campuses are often all behind a single IP address.

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Not really; most OSes now enable ipv6 privacy extensions by default, which means a client will connect with a different IP every hour or so.

as nat was only a method of dealing with lack of address space, and not a security measure, hopefully nat will become very rare...

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