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.
So, if fiat is to be eliminated, then what is going to be used in place of USD?? It’s not bad that we have the USD, cryptocurrencies are calculated based on their value against USD or other conventional currencies that we have in the world. If you’re to remove them, then what are you going to use when calculating or comparing the value of other currencies and assets? You’re free to make use of any currency you want to use, whether it is fiat or crypto, and both of them can coexist. So, I don’t think that something like this what you should be worrying yourself about.