I am thinking that yielding your national currency and the economics behind it to some faceless techno bureaucrat in another country will eventually get old. Culture and language is stronger than regulations created by foreigners. Europe has always been a region in flux, as it is now. I am thinking that France will emerge from its current doldrums, deport millions of migrants who will NEVER be French, and revert back to using their own currency, the Franc. Blood and water thing. Same deal for the other countries. The European Union is a construct for bankers and eventually folks get tired of being told what to do by financial types. The alpha males will deal with the beta males. Basic history thru the eons.