Perhaps the question itself is a little bit provocative, however we might as well consider the appearance of the cryptocurrencies simply from an evolutionary perspective. As barter was replaces by primitive, following coinage, then paper money and fiat currencies, perhaps cryptocurrencies are simple the new stage of the financial technology evolution. Certainly for the first run Bitcoin and other technologies provide rather a simple money transferring technology. However, there not seem to be any reason why the technology could not extend to a broader area, providing general financial services besides money transfer. One example for that is the appearance of cryptograhicaly funding services, like ICO-s that have the chance to replace the whole venture capitaslim. In this sense, we might as well easily imagine that in a twenty years, fiat style currencies will hundred percent replaced by crypto style financial services.