In practice, everyone wants to spend their dollars, not their gold, or their bitcoin, or their Euros, and so dollars it will be. What else is there that anyone both with pay with and will be accepted by the other party?
Soon dollars might not be accepted if US companies wants to buy things in the EU, they will have to pay in euros (part of the anti coercion instrument that Macron and others have been talking about the last couple of days)
Soon dollars might not be accepted if US companies wants to buy things in the EU, they will have to pay in euros (part of the anti coercion instrument that Macron and others have been talking about the last couple of days)