The more decentralized the better. Ideally, this would one day be taken down to the level of the individual. Realistically speaking though, this may never happen in our lifetime, and this is because the world is abundant with people who are all too ready to force their will upon others. The lesser of two evils in that scenario is Nationalism. It is in no way perfect, but it is by far less broken and more optimal than globalism.
RE: Can of Worms, Camel's Nose, Mind Your Business, Presidential Woes.