Bitcoin is something so extraordinary and beautiful that it managed to break the entire traditional system without turning back, it managed to remodel and change the whole human perception about capital.
Not yet,few people uses bitcoin compared to fiat currency. Presently,in all type of currency fiat is king because it is controlled by the government. The government controls the economy of a country. Bitcoin is an underground king which the government knows and they will do everything for bitcoin not to dethrone fiat.
My point is that bitcoin is new and fiat has been in existence for a long time,for this season fiat still remains the most used or governments will force its citizens to use CBDC and not bitcoin. Bitcoin is an alternative currency and will only be used by its lovers.