The idea of bartering is very inciting and eventually it has to happen, but precious metal are most likely not to be the answer, nor any FIAT digital currency. Imagine someone trying to buy something from you and want to pay with 5 ounces of gold. The first thing that comes to mind, is how do I know these are gold to start with? If we get to a point where we are trading with "stones", then these better be the real deal. You have to run bunch of chemical and physical tests on each piece. And even if you were successful in ascertaining their status, the next person you give these to, has to redo the testing. Before you know it, there is not much gold left to be tested.
Now someone will say that is going to one person's bank to the other person's bank transaction. One bank will credit the other the gold amount. Well now there is no physical possession of the gold (with the people not the bank), and that is one of the pillars of going to gold. I.e. you have your "wealth" in your hand.
Also, one is subject to traceability, another pillar. And there will be a whole lot of fees. I mean now, if you want to buy gold ounce, you have to pay about 3% in premium charge. And that is from the seller directly. So can you imagine what a middle man is going to charge you to send a tenth of an ounce across the world on your behalf? It is just not doable period.
Think what happened post the Corona crisis. People did not rush to acquire gold and silver, they rushed to the store to get toilet paper (a whole different discussion), hand sanitizer, masks, food, water, etc. I am sure you heard the statistics of how many people did not have $400 or $500 bucks set aside for emergency. I am sure you are watching how many people could not pay one month rent or mortgage in advance. Do you think these people are going to trade with gold and silver?
Do you think you are going to walk to the grocery store and trade with gold and silver? Imagine you have bunch of gold and silver, but if no one is willing to trade you something for it, it is practically worthless. The most likely scenario is that you are going to have to trade your metal with some one else who is as "savvy" as you are. And guess what, he or she will be trying to "steel" it from you, as in low balling the price, or not trade with you. If you need to buy food or gas, you might have to sell your gold for way less than what you paid for it. So "convertibility" is going to be a barrier rather than an advantage.