I can tell you that I will leave to Greece for holiday and I am rather scared.
I don't know if the food will be fresh or will exist at all.
I don't know if the VAT will rise until I'll get there.
I am scared that there may come strikes and there will be no place where to buy gas (already had that experience once, about 5 years ago).
And let's not talk about the state of their medical system, I really hope to not get there...
So the damage is done, the tourists are more frightened.
Greece is one of the most beautiful places to visit along with the amazing food. In this situation, don't count on ATM's or banks being liquid thus carry extra cash. Also allow for extra travel time as there may be public worker strikes.
Don't let a few bad apples (politicians) influence your thoughts of Greece as a whole.