Bitcoin's value has nothing to do with the labor theory. Both the value of the token itself & the amount invested in mining infrastructure are a fuction of the overall demand for Bitcoin. The fact that it is expensive to mine is only a reflection of market demand & some assurance against any rapid changes in supply.
Trustworthy trade comes first from having a monetary system that can't be cheated. Gold tokens can never be that. The more trustworthy some gold token becomes the more it gets used & the more it is used the more incentive there is to cheat & the easier it is to hide the fraud. Gold tokens literally have horrible incentives that runaway into all the wrong directions. Bitcoin's security in many ways gets stronger the more people participate. Proper scaling solutions do come with some tradeoffs, but not the foundational supply restriction issues that gold has.
Bitcoin also makes 2 party escrow contracts possible. This means that I can initiate a payment in such a way that you can be sure that the money exists & is now locked between us, but you cannot collect until I get my goods or services as promised. A simple contract like that is the real foundation of a trustworthy decentralized global trade network. Insurance contracts of all kinds with real monetary weight can be built on Bitcoin. Risk can be balanced in a way never before possible even among unknown trading partners. You cannot ship a gold payment (at great cost) & be sure that you will get your goods shipped back. Similarly you cannot spend or accept gold tokens & be sure that they can ever be redeemed. Even if you have an army at your disposal there is no way to be sure of such things.
Bitcoin is a liquid & free floating currency. It is currently the 22nd most valuable economy/currency in the world. A collapse in any nation's currency just means that paper is too easy to come by so larger amounts are needed to exchange for valuable things. There have been multiple currency collapses in other countries & the value of Bitcoin in those places simply goes to all time highs. In fact there is usually a premium on Bitcoin in those areas because it is suddenly so greatly needed & much more sought after. Gold is never going to be a practical way to do day to day commerce. It really hasn't been for many hundreds of years, & gold IOUs were what got us into this mess in the first place.