They can always keep printing money. However, that money is becoming increasingly devalued.
So are we really witnessing a slow motion crash even as the charts as going straight up?
Moreover, the world economy runs on oil, and all it will take in the volatile Middle East right now is a match to set the entire region on fire with war, possibly even a nuclear exchange.
Russia and China are actively attempting to get rid of the US Dollar as the World's Reserve Currency.
The Bible predicts single control of the world financial system, probably using a single, worldwide currency. It will happen, someday. Maybe in 100 years from now. Maybe, a lot less time. A lot less.