I do not understand why I should compare these currencies. The dollar is for the government, and bitcoin is for the people. So it was from the very beginning of the existence of bitcoin. And bitcoin will never replace the dollar
Dollar is for the people also and it is the most popular currency in the world IMO, bitcoin is for the humanity but not all
will be able to adopt with it especially if it is not supported by the government.
Indeed the dollar usa has a fairly high popularity around the world, as the USA is a super power countries have many branches of industry cooperation with most countries in the world. So that their currency is widely used by most countries in the world, because it is indeed the USA is a country that is quite unusual in midwife economy. But behind the popularity of the Dollar, I see a country that will replace the position of the dollar is the yuan (China). where I see now the Chinese have high enough change and it is possible the country will accept bitcoin because his system is good enough