This is why people want to choke Eurocrats - you just say things like this without providing any actual evidence, and act completely snobbishly, "Of course, daaahling, it's perfectly evident to us nooorrmmaaal people". Christ, it makes me want to throw a Molotov Cocktail through the EU Headquarters and laugh while it burns to the ground.
France and Italy have severe structural problems thanks to the Euro. Both their competitiveness and their employment have suffered. Germany needs higher interest rates, but the ECB can't hike them because of France and Italy - I repeat, one size fits all monetary policy is NOT delivering the goods. But then you come along and arrogantly deny all of this and just say "it's natural" that it should work. What the hell planet are you living on? What kind of drugs do you have to take to fly in the face of empirical experience like this, and not expect to get smacked in the face for it?
This is not some theoretical exercise - genuine working people suffer because of people like you going off some theoretical flight of fancy. Why don't you shut the hell up and listen to the people of France and Holland, who told people like you to stuff it when it came to further European integration. A Europe of diversity, where government, politics, and economic policy reflects the needs of individual nations is what will work - not the binding straightjacket where everyone has to be the same.
Ivan