Fiat is the one that has given the best financial service for all our needs. If fiat is not there the system will collapse entirely, so fiat will rule the world even when bitcoin and other currencies increase in acceptance.
Exactly and I don't think that in this century people are going to stop using fiat because if you currently see only 1% of the population or maybe 2% at max are aware of bitcoin and by the time it gets recognised by the world it will be too late as by that time all the bitcoin will be mined and there wouldn't be any bitcoin left to distribute to the people to use it like a currency.