I don't blame you from trying to be optimistic in a very bad situation, but I don't feel that your posts reflects the seriousness of the situation and its impact on daily life. This article has been published this evening by the British Telegraph newspaper.
You don't have to convince me that the issue is serious. The economy is destroyed, but this is happening already for half a year. The process now speeds up to a complete economic collapse. Nevertheless everything will be done in order to supply primary needs. With primary needs covered only transport is important for tourists, this may become an issue due to fuel issues and strikes. Those on package beach holidays this is of limited consequence, the large travel groups will do everything to have this covered (fly in with extra fuel and arrange a transfer to the hotels). Independent travelers traveling around may have a harder time arranging transport.
The real issue is security, when people have a hard time there may be an increased crime level, most likely a gradual process. In an absolute black scenario big clashes between the yes and no camps will occur escalating to a civil war. Things may get ugly quick, but for now I consider the risk of an immediate civil war very small. Just avoid demonstrations and other crowds that should suffice for now.
I believe traveling Greece now is not that different from traveling a developing country
