Here lies the problem, I think, with everyone's impending crash worries. The USD is manufactured by the Federal Reserve, and the second it's manufactured, interest is charged on it. That means the US population is paying the interest debt to the Reserve for other countries to hold the money. I actually believe Americans will be better off when it isn't a global reserve currency. Instead of using countries like Greece, Venezuela, and other wildly financially corrupt countries to prove a point, why not look at the current economic condition of the two countries that were global powers. Neither France nor England are bankrupt. Not to mention, the US can choose to spend less on military, which is currently around 50% of it's federal budget. Spend less on military, donate less to the Federal Reserve, attract more investment, live happily ever after.
I could be 100% wrong here, just my theory.