without a EU or single currency financial institutions (hedgefunds) would've played out the currencies to each other and would have seriously hurt even the strongest economies in Europe. Almost all EU countries would be in the situation Greece is in right now. People in EU who say the Euro sucks, prices have doubled blabla are mostly sjonnies who don't understand anything of economics and vote Wilders anyway.
nevertheless. the status quo is just not maintainable any more. ALL countries are in a shitpile of debt, persons in countries in a shitpile of debt (mortages/creditcards etc.), companies in debt. It seems everyone is in debt, who is lending the money you might ask (or does money actually still exist is the better question?)
Mark my words, it will all crash and burn, at the moment China or whatever decides they don't longer want to finance the debt. But don't worry, it will be a good thing.