Bitcoin will never replace fiat cash. A coin everyone mints at the same rate will. It will also replace bitcoin and all of the shitcoins.
Mark my words.
Bitcoin runs off the fumes of fiat.
even in the near future i see no reason why would fiat needs to be replaced mate because Bitcoin can't even reached being adopted so what more replacing fiat in which the trading material for long years now.
maybe there is a wrong understanding about the creation of Bitcoin and people tend to think that after beating the fiat success is what we got but for me this is a mistake.
Bitcoin will reach the top if being accepted and use wordwilde without interfering by government or any law enforcements.
this is what we called success and top.