The Euro is not a currency that any country can dip in and out of.
It is also virtually impossible to extracate Spain from the Euro, as if Spain suffers the economic collapse as expected, it will need the “German Powerhouse” to contribute more and Spain will be a recipient again of EuroAid.
It would be madness to pull out during a recession, as that is when an ailing country will benefit from the richer countries.
I do believe the Euro will see a drop in value at the end of the summer. But in no way could Spain consider walking away. If it did, it would almost become a 3rd world nation again.