A lot of the internet backbone and gateway servers are still in US territory. The UN is a paper tiger if people really call their bluff.
UN: You want out? Say goodbye to your URLs!
Departing US: Say goodbye to your basic Internet architecture. Good luck!
I hope you are right. I don’t know much about this stuff, but just giving away the domain management seems like a terrible idea, and Obama wouldn’t have done it if he didn’t think it would hurt America.
The reality is that the ISP’s and NOT ICANN are the ones who control the URL’s.