What is your take on the "United Future World Currency" that Dimitri Medvedev displayed at the G8 summit?

Last week, Russian president Dimitri Medvedev held up a coin that was minted in Belgium which may represent the economic future of the globe. The coin, which featured the words “Unity in Diversity”, – or one like it – could eventually replace all current forms of nationalistic currency.

Medvedev said that although the coin, which resembled a euro and featured the image of five leaves, was just a gift given to leaders it showed that people were beginning to think seriously about a new global currency. Source

A global economic overhaul has been called for by several nations and even the Vatican.

According to the pope it provides a great opportunity:

“The complexity and gravity of the present economic situation rightly cause us concern, but we must adopt a realistic attitude as we take up with confidence and hope the new responsibilities to which we are called by the prospect of a world in need of profound cultural renewal, a world that needs to rediscover fundamental values on which to build a better future. The current crisis obliges us to re-plan our journey, to set ourselves new rules and to discover new forms of commitment, to build on positive experiences and to reject negative ones. The crisis thus becomes an opportunity for discernment, in which to shape a new vision for the future. In this spirit, with confidence rather than resignation, it is appropriate to address the difficulties of the present time.” Source

What are your thoughts on this potentially historic shift in global economic policy?
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Sorry about the long question, wanted to try out the new question asking feature.