Iran is making plans to sell its oil in Euros. Bearing in mind that Iraq started to sell its oil in Euros in 2000 before it was invaded liberated in 2003, after which the US administration reverted it to the US dollar again, and that the fact that oil is traded in dollars is a large part of what makes the dollar strong, and keeps it useful in the world, it's not hard to work out what will happen next. It wasn't about oil? Follow the money, people.