That would kill the dollar as the dominate reserve currency.
OPEC accounts for 60% of global oil exports and Oil is the number one import of most countries.
The Euro and Pound have already lost there reserve appeal. Without cheap Russian energy, Germany will struggle to maintain its export advantages. Japan is in demographic crisis and only steps from a currency/sovereign debt crisis. The west is gradually losing the economic high ground. If the USA starts a financial war against OPEC at this point......it would go as well as Trumps trade war against China, IMO.