Decentralization is the future for a sustainable and free economic society, however the direction things usually go after an economic catastrophe is more centralized (for safety and stability, they will say), as in a single "world bank" with a single and massive metal backing in a single location (on full display).
Maybe it's my imagination running, but if everyone could visit or see their gold (of which everyone would own a share), it would lend great confidence in the world currency. The data may be decentralized (block chain), but the financial backing and regulation would be a totalitarian economy in nature. That means it would come with a price - if you don't get on board with whatever the controllers require (carbon neutral, accepting of sexual depravity, etc) they can suspend your credits at any time.
Under normal conditions, this system would fail completely, but I think an idolatrous world religion will be built surrounding this, merging pseudo-religion, pseudo-science and pseudo-economy into a single new way of life. Religious fanatics (Uber-Karens) will be the "decentralized" enforcers and regulators.
We may not see this economy functioning in our life-times, but we're watching the stage being set up to usher it in.
lol, mecha Karens
The way I see it is that there's no reason why Bitcoin wouldn't be that currency. The establishment has the means to co-opt Bitcoin into the dirt. Pegging a digital currency to precious metals is a waste of time and actually makes the currency worth less, because the centralization increases for no reason. There's really no reason to do it imo. The elite can continue ruling without going back to the gold standard; there's a very good reason they abandoned it in the first place.
My imagined scenario seems highly unlikely in our current paradigm. Money is a conceptual thing and psychology plays a huge role determining currency value, gold backed or fiat, decentralized or centralized. If they can get into our heads, anything is possible for them. They create a new paradigm, a #newnormal. The last few months has illustrated how skilled they are getting into people's skulls, and this is just the beginning.