That misses the essential point.
The problem is not just absolute performance, but increasing divergence within the eurozone itself which is forced by the currency union.
That is what will rip it apart. Compare the divergence of italy and the fourth reich as a whole. Italy is not blameless, but italy , greece and the rest are prevented from any hope of recovery as said Soros today. As I pointed out earlier, when Soros and Varoufakis both agree there is the same problem and solution is impossible,then it has to be bad!
Apart from that.A commitee 26 countries cannot agree on anything except the lowest common denomnator It is why all deals are suboptimal and take seven years, and in the case of migration no deal was reached. The only deal EU will do is not a deal because it is unnaceptable to us. It doesnt take seven years , it can be done in months. they take that long because of the impossibilty of EU state agreement.
Imagine a camel if it had been designed by a commitee of 27, worse still when hijacked by officials who care only about preserving ideology not whether the camel is useful. The camel would stand no chance of walking! Eu can not succeed because it has become too unwieldy.
Now imagine a one to one deal between two countries, focussed just on their interests. No contest in the result, far better for both parties. Eurozone is screwed. And with it the EU. It cannot make a decision, even to save its life.