Never. United States Currency is the worlds reserve note. All oil can only be bought with US currency. Other places like Zimbabwe currency is so far hyper inflated that they use The US dollar mostly.
US is a strong country with a strong economy, I guess almost all country accepts dollar and I can say it's dominant. Though in this world, fiat inflate it's value but not so fast with dollars. People has the choice whether to invest their money in bitcoin as we believe it will be big in the future but not to the point that it's going to replace it.