Iran and the US dollar

With tensions rising, like Iran blaming the US and the EU for the bombing of the holy shrines in Iraq and with Iran switching from the US currency to the Euro for oil purchases, I think we’re in for a big surprise in March.  I’ve been hearing from various sources, be it Coast 2 Coast with George Noory to regular newspapers, that this is something to watch out for.  Something as big as this is going to be nasty.  It is going to be nasty for the US as it stands right now when a country purchases oil through Iran, they have to exchange their currency or buy US dollars in order to purchase oil.  This is what Iran plans on changing.  They plan on using the Euro which means bypassing the US altogether.  I guess we’ll just have to wait and see.