Bye, bye (and good riddance) Euro

Let me get this straight.  You are going to take a bunch of countries and peoples that pretty much resent and hate each other, have invaded and killed one another for millenia, have tremendous disparity in culture, work ethic and wealth and put them all together under one currency.  Without the reserves in place to make sure the currency will stay viable.  And no power to enforce measures against member states to keep their fiscal houses in order in return for belonging to that currency.  Yeah, what could possibly go wrong with that?