I agree with you on us being better off by converting our dollars into precious metals because the dollar is constantly depreciating in value over time, and one day the US dollar may be replaced because of this depreciation, with precious metals we'll be able to convert it into the new currency if need be. However, I do believe the replacement of the US dollar (in terms of the currency used in the US) will be another fiat currency, unless US citizens completely oppose it and strongly support an alternative for it. Regarding the one world currency, I'm quite skeptical of it, as elites of other countries would have trouble surrendering control of their country to the elites of the US.