All fiat currencies die. Then again all currencies die, so fiat is just a subset. The USD will die. Its just a matter of when. The problem is that economic empires collapse from the outside in and the US is the center hub. The dollars death knell won't arrive until after the Euro/Yen/Pound and yes even the Yuan are all crushed first.
Confusing the US fiscal profligacy with other nations is a mistake for a couple of key reasons. We still do have the worlds reserve currency. Notice all the kvetching about the dollar vs the peso? Nobody in the US worries about the exchange rate of dollars on a day to day basis unless they are a currency trader. Second the US is still the worlds, "consumer of last resort." This is changing, but not as fast as people crowing about the end of the dollar would have you believe. Third and I believe more important, the US is undergoing a massive deleveraging in credit, and there is a huge difference between credit (promise to pay) and currency ability to pay.
Confusing the US fiscal profligacy with other nations is a mistake for a couple of key reasons. We still do have the worlds reserve currency. Notice all the kvetching about the dollar vs the peso? Nobody in the US worries about the exchange rate of dollars on a day to day basis unless they are a currency trader. Second the US is still the worlds, "consumer of last resort." This is changing, but not as fast as people crowing about the end of the dollar would have you believe. Third and I believe more important, the US is undergoing a massive deleveraging in credit, and there is a huge difference between credit (promise to pay) and currency ability to pay.