Bitcoin is unlikely to replace the dollar as a global currency. This is also said by one of the highest rated analysts of foreign currencies.
The global currency is the one that facilitates cross-border trade, including investment and international debt markets. Global central banks hold foreign exchange currencies to protect against significant fluctuations in exchange rates, as well as in exchange rates. I think we are a long way from when Bitcoin will be able to do that.
As today's current situation, dollar decreased from its reigning value for over several years. Yet, Bitcoin's value rises above from what we've been expecting and take note that the pandemic is still active while bitcoin's spreading its supremacy as a digital currency. For me, the current situation tells us that there's a possibility for bitcoin to replace us dollar and still bitcoin needs to have more progress from time to time.