The American reserve currency received a lot of criticism in recent years largely because of the quickness with which Washington slaps sanctions on other countries. All sorts of economic restrictions have limited the ability of dollar-using countries to trade with countries which have fallen foul of the US.
All reserve currencies collapse in time and the US dollar will be no different. Digital currency will give the government near full control over your life. Do as they say or they cut off your access to your bank account. But it's easy to see most people are to stupid to see this.