Simple economics suggests that the more diverse the economies within EMU the greater its chances of failure. It is important to remember that EMU is a political rather than popular movement. The people of Germany have always indicated that they would rather not join, their political leaders have not given them the chance to vote on the issue. I see no reason why either side of the argument should have the right to claim they are good Europeans. Its circularity is immediately apparent.
History is littered with failed grand designs.
They often leave poverty and bloodshed in their wake. Not so long ago many believed that the triumph of Marxism was an inevitable consequence of history, they were wrong. Britain has escaped Marxism, Fascism, Absolutism, and many other political fashions. All were seen as inevitable in their day. EMU is only inevitable if we have no right to reject it.