In terms of resilience, bitcoin is indeed far superior because it has the ability to maintain value while fiat money always loses value in inflationary conditions so that storing bitcoins is much more potential than storing currency. Fiat currency is still quite needed because it is still a legal means of payment in making transactions and in my own country bitcoin is not allowed to be used for transaction tools such as fiat currency so that the intended use of bitcoin is more towards the investment process. Bitcoin will indeed provide more value in the long term and its price will continue to grow so keeping it as an investment step will be much better for the future.
My opinion is that in future transactions BTC will be more dominant when all stores provide the option to pay using digital currency. Fiat of course will not disappear either because there are still remote residents who use it as a means of transaction only if someone wants to shop in many categories and large values are too vulgar to carry but if in BTC just one click is done.