just like every other monetary unix (US$, EURO, etc.) the value of the bitcoin is only dictated by the faith and confidence that investors have in the currency. Just like in every other part of economics there is a strong portion of self-fulfilling prophecy that plays a role too. As long as 'important' people state that they believe that bitcoins have a sting future, they will have. So, as your resident economist of fame
I say that bitcoins will be a good investment, or not, depending on what other famous economist will think.