Gold as collateral have a long story from mid-centuries (and even earlier). However now we barely use it, because American dollars has spread its hegemony on the world. Before Bretton woods crisis there was a good chance for some improved money system to appear but in fact tricky politics of the US lead the world to rely on the dollar in international exchange. It only benefits US state in many forms.

Dollar doesn't have intrinsic value aside from the fact it is the strongest currency in the world right now (with the biggest debt).

However, personally, I see future of crypto as a form of collateralized and non-collateralized stablecoins (may be a mixed stablecoin) that will be so comfortable to use and so convenient to measure goods with it'll overcome the dollar.