Wow, I'll be darned if you are not completely right. Saddam Hussein tried it too....
That's what it all comes down to. The dollar must be the top currency, even though it's actually not supported by anything other than the US military.... and then the need to commercialize everything, American style.
But there are two countries which the US cannot take on and be sure to win: China and Russia. Europe is already in the US pocket...
But if China and Russia could come to an agreement together to switch do some alternative, then things might change. Apparently China itself has masses of dollars saved though, and can not afford for them to lose their value.