In my own point of view it will not be. Why? because there is Federal Reserve, why I say so? because think of it if bitcoin will be the source of exchange worldwide then where do the biggest financial community in the world reside? I think it take a lot of time before money will be lost in and bitcoin will be prominent in exchanging some goods and services. I think money and bitcoin will be hand to hand in handling the most used currency in the world in the future.