No matter how much we encourage people to use bitcoin or other crypto currencies, there will be some people who will always prefer fiat currencies for one or more reasons. Even though bitcoin reach $1,00,000 per coin, they will still be using fiat currency just for the sake of traditional way of spending money. Now, even if bitcoin gains a large space in the mainstream fund transfer industry still fiat will have its value just because it is governed by governments and they have constitutional rights to manage currency and its values.