the goverments have plan to create their own cryptocurrenicies, so the btc and eth was just testing currencies to see how it works and get people to use with cryptocurrenies?
I don't think government will and want to go the Cryptocurrency way, there are other huge side of economical effects when a country currency is pegged to cryptocurrency.
How do you think the relationship between volatility and economical growth will react, it will be a suicide which will be even centralized by big players and politicians. Let's assume your country releases a coin prototype for example of 31 million and governments decide to withhold 70%, how will you feel?
Have you thought about change of regime? This are my reasons and opinion.
first whats wrong with fiat currency?
There are so many thing wrong with fiat currency, for example : devaluation of value, Price Instability and concentration of wealth to certain groups of powerful people. This is pure wickedness which is heartedly entertained by average people in the real world.
In cryptocurrency, this has birth to DeFi and its really working except for some little difficulties.