Despite the success records of Bitcoins and individuals' investment in bitcoins, Bitcoin may not replace the traditional currencies. As traditional currencies are printed & controlled by the governments whereas bitcoin doesn't control by a third party.
No doubt, investors and individuals considering it as a safe vehicle against the finical crisis. But, many people still don't know about what is bitcoin, how it works, and the investment benefits of bitcoins.
Apart from that, there are many other aspects. Traditional investing has "shapes and forms" whereas bitcoin does not. it changes the level of confidence in an investment. Unless bitcoin has started mass adoption I'm sure maybe it will change people's perspective in valuing bitcoin. But for now, because shape and form greatly influence people's confidence in investing, it's quite difficult for bitcoin to break through the barrier