As for v6 and v4, it depends on the scope of what you want to cover. "Interesting" endpoints like new sensors and wireless devices can be covered by v6-only approaches, but there will be a huge swathe of the Internet which will remain v4 for many years. They are not going away. If RRG ignores them, people will develop solutions for them, probably involving NAT, and they will do not sooner than later. If you tell them you have a v6 solution and you'll get to v4 "later", you've lost them.
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