The euro works when you think of it a common market based on a common unit for bartering goods. It is fantastic on a practical level as tourist or for trading goods. You can drive for hundreds of miles and still use the same currency. Incredible isn't it? Admittedly that might be lost on our USA, Australian, Russian or Chinese members.
There is a small hitch that while you may be able to use the same coins to buy a coffee, the locals use a different language so can't understand your order. Of course that's not unique to the Euro, it can happen if you go from Walloon to Flanders, New Jersey to Manhattan, or cross the Swiss Rosti line.
It falls apart when you factor in different rates of growth, national debt, and all those other complications that result in exchange rate fluctuations. Those exchange fluctuations exist for a reason, to wish them away is like Canute holding back the tide. Or to get slightly back on topic, it is like ignoring the different rates of thermal expansion between an engine block and carbon fibre chassis.
To get right back on topic, we'll see the crisis used as an excuse to settle a myriad of vendettas, from Ferrari saying its cheaper to use the old V8, to Spa disappearing from the calendar, to Bernie selling out to pay TV.