Gold can lose 40% of its value in a day - so can the dollar - actually the dollar can lose even more. A money / medium of exchange called a "fiat" has repeatedly grown to be worth nothing, but Gold never has been worth nothing. Your delusion of the dollar being "all that" is are just that - delusional.
The proposal for the greenback at the UN had variation of 18 to 33% backing by the US dollar and little tiny countries like China and Russia opposed that - the formula is not static, determined and can change at any moment. Of course its likely the currency would be backed by the dollar at first, but it would also likely change over time; regardless the US would no longer be able to just print up currency for energy and goods it consumes.
The best part of the economic collapse that just happened 08/09 is that the world suffered worse then we did. That doesn't mean the dollar is strong it just does not have a current competitor. Both China and Russia would like to change that - what happens of OPEC decides to change that and no longer takes dollars for oil - your life as you know it just got screwed. Mine would be fine - how will you buy bread?