The problem is that the dollar is loosing its complete value when the cryptocurrencies are Skyrocking and people are leaving the dollar finally in the next 2 or 3 years.
I found a nice article, where the problem of the dollar is described very shortly but adequate:
https://steemit.com/dollar/@mathsinnature/for-those-who-are-interested-in-the-middle-east-and-the-dollar