The people control the army. Well the closest there was Rome, and eventually one guy said screw you all I'm going across the Rubicon! A world where the people rule is all fine and well on paper, but people are too different. If you divided all wealth in the world up (assuming you could do it) evenly. Every pretty rock, every bullet, every greenback, every chicken, and give it out. It would be back where it is today in less than twenty years.
Why? Some people are spenders, some are savers, some are hoarders, some cheat, some lie, some steal. The same thing with government. You'll have someone who wants to be top dog, someone who wants to take the top-dog position.
I also like that world you use, Anarcho-Communist. It's very oxymoronic. A communist can't believe in anarchy, and an anarchist can't believe in communism. So how does that work? I'm not being glib I'm actually very curious.
Smart money is that if I could make the world into an anarchy in a decade you would have a democracy, a dictatorship, a commune, a republic, and another Holy Roman Empire. (Gosh I'm a sucker for that one, title alone.)
Simply because your average person craves some form of familiarity and you can't have that otherwise.