Currently, there are many usd-based stablecoins such as, usdt, busd, usdc and maybe many others. To be honest, I used to think that crypto would completely eliminate the usd's dominance of the world economy but I was wrong, it turns out that usd is now evolving to crypto (stablecoins). What do you think, whether in the future bitcoin or other crypto can replace the role of currency in each country and leave fiat currencies such as usd, euro, yuan and others.
Well I think we still have a long ways to go before you should consider yourself wrong in that area. That being said I do not believe that cryptocurrency will replace fiat currency anytime soon. I think that it will continue to work in conjunction with cryptocurrency and eventually yes, devalue fiat a bit, but I simply don't see it taking over ..maybe ever, unfortunately.
until now there are still a few countries that use bitcoin as a currency legally, and other countries have not expressed their position to use crypto. and it looks like this will happen in a long time along with its development later. but don't worry because currently bitcoin is more promising to make a profit by trading or investing, because it still has a great opportunity