Bitcoin can not prevent future economic crises such as the one we are seeing in Greece today. The Bitcoin community will disagree with this vehemently. In this regard, The Finance Guy is a true contrarian

Everyone else says Bitcoin can prevent a future Greek style disaster, yet we are stating the exact opposite.  We are looking at the same information,  but we are drawing an opposing conclusion.  It's only natural to assume that we have made huge errors in our forecasting.  After all, it sounds like we are calling the earth flat, or saying that 2 + 2 will actually give you 79.5!  It sounds like we've gone mad