In fact fiat money is still being used until now, in my opinion, even though corona is associated with humans, they can't hold fiat money, it's just a myth, Bitcoin is a digital currency, but for now there is no country that implements a Bitcoin policy as a means of payment and transactions, so relax Bitcoin will not be a dollar.
Fiat currency is still being used en masse because the government's role in encouraging the use of bitcoin is still minimal. Besides that, education about Bitcoin and other crypto-assets are really not evenly distributed, even in big cities there are still many people who don't understand what bitcoin is even though they are always up to date on social media. Bitcoin is ready to become a global currency when many people already understand what bitcoin is.