What the hell are you talking about? A state is a centralized entity with a monopoly on the legitimate use of force/ultimate decision making in conflicts, over a given geographical region. I interpreted your question to be about replacing the state full of people under it with a decentralized collection of people living in anarchy over a large geographical region, forming some sort of defense that you claim can't exist. A community, with a mechanism for defense. I proceeded to explain the most basic form of that defense. This method of defense is the replacement for the state. You literally posed the question of how anarchy REPLACES the state. Not becomes the state. Anarchy is just a peaceful interaction and organization of a community of people, by definition.

If you're trying to attain victory by definition, you're not very good at it. This is second rate sophistry at best.