We can only hope so, but probably the EU will make them stay in whatever the cost to Greeks.
The concept of a united Europe patently does NOT work, or else we would all not have chosen to separate ourselves from other tribes and nations in the preceeding 2000 years.
I live in Spain, born in England, choose Spain as it suits me, I try to be as assimilated as I can, my children are Spanish, one works in America, we all recognise that we have differences between us and the Spanish.
If the UK withdraw from the EU, or Greece caused a collapse, and the Union disintegrates, I would swap my Brit passport for a Spanish one instantly, that is unity with a country, but nobody forced me to live with them, and as I came here 27 years ago, before we joined the EU, I never forced them to accept me.
Nanny states can get out of our lives please, then we can start rebuilding what the banksters stole form all of us.