I'm all for coops, but they presuppose the right to exclude. Like you said, Joe Smith can't just walk into the factory and start using it to make his shoes unless the property owners - the coop - are fine with that. I don't like differentiating private and cooperative, because they're not mutually exclusive; private property can be owned and operated cooperatively. All private property does is seek to reduce conflict over resources by assigning use claims. It's something we all do, and it's intuitive.
As long as it's all voluntary, I'm all for it. Consent is king.
RE: Open Borders vs. Closed Borders: A Market Anarchist Perspective