Sooner or later, someone will take a loss. Either voluntarily or when Greece defaults and goes bankrupt
This is why single currencies have to be backed by a single state, or they fail. A currency must be unconditionally supported by it's issuer - there should be no such thing as Greek or German debt, only Eurozone debt, backed absolutely by the united strength of the whole Eurozone. A Eurozone in which every citizen regards themselves as a euro-citizen first, a common identity and shared destiny that allows for direct transfers of cash from rich to poor areas, where dumping a weakest link (no matter how "badly behaved") is literally unthinkable
Instead the euro has shown itself as being 19 separate countries, where national identities are paramount, where there is no sharing of risk or debt let alone transfers of cash - and where in a time of crisis, disunity prevails as each member looks after it's own interest sand stuff everyone else
In the USA, all regard themselves as American, all states back the dollar unconditionally, there is a centralised federal government and treasury, big transfers between rich and poor states - and no one would even think of chucking out a State from the Union
Europe has shown itself a paper tiger, no one will ever take it seriously again. Yugoslavia, the migrant crisis, the euro - they have all shown that European unity is a fantasy, it does not exist