It is impossible to predict the eventual outcome. As mentioned before, the gradual reordering of the financial system along national lines could make an orderly breakup of the euro possible in a few years’ time and, if it were not for the social and political dynamics, one could imagine a common market without a common currency. But the trends are clearly non-linear and an earlier breakup is bound to be disorderly. It would almost certainly lead to a collapse of the Schengen Treaty, the common market, and the European Union itself. (It should be remembered that there is an exit mechanism for the European Union but not for the euro.) Unenforceable claims and unsettled grievances would leave Europe worse off than it was at the outset when the project of a united Europe was conceived.
But the likelihood is that the euro will survive because a breakup would be devastating not only for the periphery but also for Germany. It would leave Germany with large unenforceable claims against the periphery countries. The Bundesbank alone will have over a trillion euros of claims arising out of Target2 by the end of this year, in addition to all the intergovernmental obligations. And a return to the Deutschemark would likely price Germany out of its export markets – not to mention the political consequences. So Germany is likely to do what is necessary to preserve the euro – but nothing more. That would result in a eurozone dominated by Germany in which the divergence between the creditor and debtor countries would continue to widen and the periphery would turn into permanently depressed areas in need of constant transfer of payments. That would turn the European Union into something very different from what it was when it was a “fantastic object” that fired peoples imagination. It would be a German empire with the periphery as the hinterland."