That Target 2 thing is a myth though cos during a euro breakup you only pay for the amount of the ECB that you own.
Therefore Germany would be smiling and anyone with a trade imbalance with Germany is not.
The large imbalance shows quite simply that money is flowing into Germany from places like Spain, Italy, Greece etc etc etc in the form of bank deposits and trade.
The reality is that Draghi could solve any target 2 problem caused by a breakup by updating a spreadsheet in ECB HQ by deleteing liability and inputting the word asset instead.
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