In my opinion, I feel it is well said that "bitcoin is a freedom money" just simply because of its cryptographic nature and the liberty it gives its users compared to that of Fiat currency, but even in the midst of these, Fiat currency is still far adopted in many countries till date and the possibility that Cryptocurrency would be fully adopted by many nations of the world is very slim. So while bitcoin is a freedom money, the ones in power do not want people to have that financial freedom, therefore preventing people from legally having access to the freedom money (Bitcoin).
Even if crypto is widely accepted, fiat will not disappear, fiat has been around for a long time in the world and it is the measure of the value of everything, I don't think it will disappear because of bitcoin or anything something else.
Because governments cannot control bitcoin, they will find a way to prevent their citizens from using it, if citizens use bitcoin then they will lose power. Currently, the government can only control our activities through centralized exchanges.