We don't fare just fine with the Euro. By having fixed exchange rates between countries, the only remaining economic variable that can be adjusted, is employment. (It doesn't matter if it's public or private employment). This is why the EU tells France and other countries to reduce the number of public employees, and why France has been losing one 1000-employee enterprise every day since the introduction of the Euro.

And the countries you listed are not the only ones in the Euro, think about how Spain, Portugal, Italy and Greece are faring with the Euro! It's worse than a war!