I don't see how my question is off-topic:
I get that I made some murky statement, especially something like "forcing the ISPs to abandon IPv4 in favour of IPv6 in order to make NAT go down in the annals of history" and if that's the reason for putting it on hold, let me know and I'll go and remove those phrases.
However, I don't agree with the question being generally off-topic.
You and the community state that a question is on-topic if the following requirements are met. I think my question clearly meets at least partly or fully the following requirements:
- servers operating as a router/switch/firewall;
- design or theory of protocols used to operate a network (e.g. IP, TCP, routing protocols, STP, etc);
- production troubleshooting or problem resolution;
- implementing and enforcing network security or policies;