Bitcoin have the big chance to replace fiat. Becouse people in some countries were change their money in to bitcoin to save their wealth when their fiat price is fall against USD. Those country need to import logistic that they have to pay with USD. So I think people will prefer like to use bitcoin than fiat.
yes it can be there is always a chance but i think still it will take decades because still a very little number of people are using bitcoin and almost all the people also depend on fiat, therefore it is not so easy to replace fiat so soon.
It will simply not gonna happen, bitcoin and fiat will exist and we cannot deny the fact that fiat is more powerful than bitcoin. Live with the reality, it's alright to hope for the best of bitcoin but we remain realistic in any way.
For many of us we find it so difficult to say that bitcoin can replace fiat, and that is true because in our world today we are still using fiat and that is the case for many years to come, because people are still not ready for it, and us we are a part of society so we always need to exchange our bitcoin into fiat so we can live.