A crash course in changing the world.
I think the biggest change that will occur with regard to currency will be the overall shift in electronic transactions. Obviously that has been a huge transition over the past 50 years or so. It seems like over the next 50 years paper money will essentially become obsolete. With the rise in technology large international transactions (as well as fraud, corruption, etc.) will become much more commonplace. I believe the world may move towards one worldwide currency as well to simplify transactions as well as 'level the playing field' among weaker countries.