It really boils down to the US/UK hegemony crumbling, something no small civilian group should be able to effect, which is why this is such a difficult question. As it has been historically, this will almost certainly be due to a combination of a losing war, the rapid economic decline of national economies during a losing war, and finally terrible civil unrest and something like revolution. These will be dark days indeed, whenever they should arrive.

The odds are slim that the new seats of power will be any less abusive/corrupt. An anarchy-leaning person would hope for a largely unfilled power vacuum instead, much like the early Middle Ages in western Europe.