[quote name='thrustbucket']Another thing to think about is that, in a way, a global currency is already half way implemented. Plastic.
If there ever is such a thing, it will very likely be pushed for all electronic.[/QUOTE]
If you mean credit cards, I don't think that actually makes much of a difference, because credit card transactions are still denominated in different currencies.
Electronics have made a difference, though - you don't even have to worry about the cost of paper anymore when you're creating new money!