What is the best case for a state that you've heard in regards to the economy? I've been told that the state is needed in order to: 1) Protect private property 2) Protect basic rights so the mob doesn't rule you 3) Public goods (like paying for defense since if everyone thinks everyone else...
Secession is the only real hope. Maintain the free trade and common labor market, but get rid of the Euro and leave the political sphere. Losing your sovereignty to a national government is bad, but getting it lost to a multi-national government is even worse.