If I was a Greek living in Greece I'd be buying up gold and silver right now. Bitcoins? My bet is 99% of the general population (ie. not geeks) don't know what bitcoin is, where it is bought and how it can be used to move money outside the country.
Yeah - but even if the 1% started buying Bitcoins - this would move the market. Bitcoins are still such a small market, despite being a global one.