I think we are a long way away from that. I didn't think so 3 or 4 years ago,but that was before the euro crisis. Right now I'm thinking the Euro is the first one to go. I know no one likes good news, but the world has it's eye on europe right now.
If the change comes I think it will come from outside the United States. If the petro dollar is replaced by a mixed basket, and china decided to back it's currency with gold we might be in real trouble. We would then be swimming in dollars. Other countries would choose to stick their money into a gold backed yuan, instead of the almighty dollar, and no petro dollar means that countries don't need to hold on to our dollars just to purchase oil. Right now everyone is holding still waiting for the euro to do whatever it is going to do. It would be after that in my opinion.