i really do think the anarchists around here are actually people who want to live in utopian societies, but they use "anarchy" instead because that sounds more achievable.
in terms of decentralizing government, i think that is a utopian idealogy. maybe i'm a little bit cynical, but there's just no fucking way it's happening. there are 7 billion people in the world, of which many are smart and "hungry" for wealth and power. there is no way we are going to get them to play fair. and the thing is, the way to climb to the top, is to manipulate the blind and ignorant... which is what present day republicans are doing with their white conservative base, and what democrats are doing with their "i'm poor, give me free stuff" base.
It won't be "utopian" in the least. There will still be social and economic conflicts, still be poor and hungry people, still be issues with crime, and still many of the same problems we have today. The biggest difference is that everyone will have to be responsible for themselves, and everyone will have a much wider choice of things to be responsible with, since services typically provided by government will likely be different when provided privately, and you'll have more options to choose from. There will also be way less waste of resources, since organizations that are not efficient will be forced to shut down, instead of continued to be supported with tax dollars "for the greater good," and change and new developments will be much more rapid due to fewer restrictions.
As for those people in power, combine the anonymity of bitcoin with assassination markets, where the more someone hurts people, the higher the bounty on their head grows (funded by completely anonymous donors), and you'll see people like that learn to behave very quickly.
Finally, it doesn't have to be a global thing that applies to all 7 billion people. We can still have countries "ruled" by anarchy alongside countries like North Korea. The difference will be that North Korea type countries will be rapidly falling appart, while the anarchy countries will be the richest and best defended (privately, and efficiently) in the world.