I have no doubt about the future of blockchain. Eventually it will evolve to a basic technology used in almost every area of everyday life.
BUT I'm not yet convinced that Bitcoin & Co. will replace fiat currencies that easily, and I'm sure many regulatory actions will follow, endangering the current situation (at least those actions will determine the market for the next few years).

(keep in mind, i do not really have knowledge about trading and finance systems, its just my personal evaluation)