I disagree, you speak like the united states owns the internet. No one owns the internet. That also means no one actually has to follow IANA's rules, why should they wall themselves off and build out their own air-gapped infrastructure just to circumvent problems imposed by IANA if IANA and the USA don't actually "own" the internet. You can't take the internet because no one owns the internet, get this shitty idea out of your head, internet doesn't belong to anyone, it's all of ours. That also means people, organizations, and countries (especially countries) are free to use alternate DNS systems with either partially or fully forked DNS Root servers.

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If you want to control it you should build your own

Besides the self-hosted DNS servers for Pretendo, AltWFC, and a few GameSpy games (which I also host the servers for) I have no intention of actually doing this, but I am pointing out that no one has to, nor should they, go all out like you suggest if they wanted to do this. They do not need to build out separate internet like you suggest to control their own Domain name system.