Well, I contest that the only plausible way for something like this to happen would be a total break down of every government on earth, either by a natural disaster (meteor, comet, Yellowstone, plague of some sort) that killed off a lot of the worlds population or by some man made disaster, like nuclear winter.
because, in the meantime you would have governments to deal with. the UN is about as bully and fly shit, they have no real power over anything. even there "army" is a goddamn joke who nobody takes seriously.
so. yes, something could be set up in the future but to speculate on it actually slowly being implemented into society today would mean nothing. the world will go on, as it has until something awful happens. I think