Yes that is the concern, but Greece is totally bankrupt, it will not pay its debt. Eventually it will leave the Euro, to me it seems inevitable.

 Other indebted countries that gave in to tough reforms just a few years ago must now be feeling that Greece is getting away with murder.  The precedent being set will come back to hunt the Euro zone in the future.  Certainly, these indebted countries will use the same tactics Tsipras is using. 

 This kick the can down the road is eventually going t catch up with all the world’s major economies.