I think not, fiat money will never be replaced by bitcoin.
because it is the tool we use for the current exchange, bitcoin is more suitable for the investment tool.
I agree. Don't get me wrong, I am a firm believer and supported of cryptocurrencies, but on the flip-side of things, we can't disregard the fact that fiat money has been present for years. It has played a big role that really helped each country and their own business sectors grow, and so, it would be too farfetched and uncharacteristic that they would just set them aside for another currency that is at best has not proven its mettle just yet. Therefore, instead of replacing, I more so see it giving fiat money giving a run for its money by giving it good competition.