aside from the fact that there are only going to be 21 million bitcoin ever (although actual supply is theorized to be about 4 million less due to people losing access to their wallets) I think bitcoin would be a good contender for a universal currency. I mean it already kind of is, but with more people accepting it because its easier than incurring foreign currency fees and other bogus stuff banks like to charge, maybe they will come out with paper/coin world currency in response. World trade market would be much easier if everyone used the same money lol