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.
That is what you can see today. Butif we look forward we can conclude that more and more people are loving the cryptocurrency. They tend to use to more often. Also there are transactions or payments of bills that used cryptocurrency as a form of payment. It might be a long way but it is not impossible to happen.