The question is does it matter? If they're only adopting bitcoin to get their money out of the country while the banks are closed, this is meaningless, as they'll convert to a more stable fiat elsewhere.
Not all of them will convert their BTC back to fiat. Some of them will keep a small part of their wealth in the form of Bitcoin. Anyway, this gives an ideal opportunity to popularize the Bitcoins among the ordinary Greeks. Bitcoin will be getting a lot of new users in the next few months time from Greece, and who knows, this might even trigger another spike in the exchange rates.