http://www.atimes.com/atimes/Middle_East/HC10Ak01.html"More significant, the oil-bourse argument is a red herring that diverts attention from the real geopolitical grounds behind the march toward war that have been detailed on this website, including in my piece, A high-risk game of nuclear chicken, which appeared in Asia Times Online on January 31."
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"A full challenge to the domination of the US dollar as the world central-bank reserve currency entails a de facto declaration of war on the "full-spectrum dominance" of the United States today. The mighty members of the European Central Bank Council well know this. The heads of state of every EU country know this. The Chinese leadership as well as the Japanese and Indians know this. So does Russian President Vladimir Putin.
Until some combination of those Eurasian powers congeal in a cohesive challenge to the unbridled domination of the United States as sole superpower, there will be no euro or yen or even Chinese yuan challenging the role of the dollar. The issue is of enormous importance, as it is vital to understand the true dynamics bringing the world to the brink of possible nuclear catastrophe today."
in other words the Iranian oil bourse cannot do anything on its own. The day the challenge will come, it's not from Iran. Look how the UK pound disappeared as the global currency :
"Prior to World War I, the United Kingdom had one of the world's strongest economies, holding 40% of the world's overseas investments. However, by the end of the war the country owed £850 million, mostly to the United States, with interest costing the country some 40% of all government spending.
In an attempt to resume stability, a variation on the gold standard was reintroduced in 1926, under which the currency was pegged to the gold price at pre-war levels, although people were only able to exchange their currency for gold bullion, rather than for coins. This was abandoned on September 21, 1931, during the Great Depression, and sterling devalued 20%." (Wikipedia)
it was the debt that killed the pound, it will be the same for the dollar