This is already happening. The coffee shops, kiosks and warehouses in Denmark where I'm from are packed with economical refugees from Southern Europe.
The sad part is that the ones that leave are probably the most driven ones, and thus the ones the southern countries need in the future.
And there's the problem... you're either a union or you're not. Can't pick and choose which elements of union and sovereignty you want.
It will be once the next European war is over.
America wasn't as unified as it is now until after the Civil War and the subsequent passage of Constitutional amendments to fully and finally not only abolish slavery, but to make sure freed blacks would be full citizens, despite what the states formerly in a state of rebellion thought about it.
If a state isn't able to use currency exchange rates to control in flow and out flow of money then you need these types of things to keep the system stable. Europe doesn't.
So you are indeed right about not being able to pick and choose. You can't take control of a counties currency away from them without guaranteeing that the central bank and government will have their back economically.
I remember when we have here very nice, modest and that can only be called as "elegant" people from Ecuador for example. Not being ironic at all. Hard workers, very responsible and good people.
> The sad part is that the ones that leave are probably the most driven ones, and thus the ones the southern countries need in the future.
The current way of doing things by the euro-kings in Europe will most probably lead to a big chunk of land and economy in many southern european countries ending in the hands and future property of Russia, China or Saudi Arabia I guess... they could easily atract workers as needed. Don' worry by this.