Monetary markets are not always completely rational. Bitcoin has value, it's a sign of how desperate we are to have a form of currency for trade. I don't think Trump rants have anything to do with the value of the dollar. China buys dollars and Euros to have a currency available and respected around the world in case their is a run on the yuan. China will become the largest economy in the world, that said if you lived in Norway would you care the Norwegian economy is insignificant as long as your standard of living was pretty dam good.