Anonymous already rules the world. They're your mailman, your neighbour, your secretary. They teach your children, they supply your milk, they repair your boiler. Anonymous is that guy that handed your phone in to the hotel reception when you left it at the bar, as well as the receptionist. They're your favourite actor, your local police force, your mayor, your kids. They typed out this post, and are also currently reading it.
Anonymous is a state of being everyone has experienced at some point or another. Some of Anonymous doesn't play by the rules, but other members make the rules. They already rule the world, we simply only notice the oddballs, the extremists, and non-conformists amongst them.