The World Bank actually recognizes 8 world reserve currencies, the dollar just happening to be the biggest. And that's what it will remain, the only two serious runner-ups having serious issues. The euro has too many issues with political stability, and the renminbi isn't freely convertible.
Thats a Joke...World Bank...IMF Please ... 8 world currencies Hows that Euro going, Or the Pound Sterling..hehehehe its all Fiat Money sir.