"War torn humans"

How would you propose taking away "rights" from individuals, corporations and up til now sovereign states? I'm afraid the UN is not a very good response.

You might be imagining the worst case. I'm just assuming that these three groups will all demand their own advantage during the reorganisation..

smashed into compact cities..

..if that's the way you see ending suburbia. If you want to "save" the earth in any acceptable way, it will have a lot to do with sacrificing living space on the ground.

with little or no resources..

as if we had a great choice.. Resources WILL be strained.

will have no will or inclination to produce.

And then you continue my example of Hong Kong. Funny that the Chinese there didn't roll over and suck on socialist teats.

Yes, Hong Kong is a good example of what will probably be a viable organisational solution, if not Cuba..

Yes but the "Hong Kongians" (is that right?) haven't had all their rights taken away by said "draconian world government"...not yet anyway. You're definitely leaning toward Cuba with the DWG model for sure...not that we can't learn an awful lot from the Cuba model to be sure.
Depending on how things go in the next couple of years we may very well see large parts of this country wind up looking very "Cuban".