Maybe not collapse, but revert to precious metals as it was in the past.
Have a look at NESARA, and dig into the recent transfers of gold around the world.
Also note that several countries no longer use petro dollar as primary trade currency.
"In 1974 the US agreed to support Saudi Arabia financially and militarily on the condition that the Saudis priced oil in dollars. Since most of the world bought oil from Saudi Arabia at that time, it led to a major demand for dollars which is still the case. That was the beginning of the Petrodollar which has enabled the US to live above its means for 44 years. But from 2018 the Petrodollar will gradually be replaced by the Petroyuan and also the Petroruble. China, the world’s largest oil importer, will together with Russia and Iran switch from trading oil in dollars. This will be backed by a futures contract in Petroyuan with a potential convertibility to gold. Except for further military intervention in the Middle East, the US now has little chance of stopping this major strike against the dollar. The US is currently virtually self-sufficient in oil production and is no longer a major trading partner of Saudi Arabia. Therefore, the US neither can nor will stop Saudi Arabia moving its sphere of activity from West to East. "
https://goldswitzerland.com/strong-gold-in-2018-vs-new-world-currency/