Look the irony, the fiat which is still the denomination of Oil is the US Dollar, surprisingly US is not taking any adverse step to ban crypto... all other countries which bans crypto are doing to bring in regulation and correct the tax evading behaviour of their people. Major part of Europe has not banned, France for a change called for crypto startups as such they are a Fintech nation.
The move forward by OPEC nations needs to be observed, they have a vested interest to see crypto survive as it will bring the equation much to their side, if they can trade without dollar. The stability in oil market is something that the rest of the world is favoring whereas the OPEC nations may like to have a surging price, when that happens as per the projections, Gulf nations may accept crypto to destabilize dollar and when the trading can be done in crypto, the valuation will soar. One have to look at the actions of crown prince of UAE, a move of this order cannot be ruled out.
What will be the action of US then? Central bank / Trump may ban crypto in US at that point or wage wars like someone stated previously on countries and create a trading route for weapons which is dollar dominated.. this will be endless and finally crypto will survive..