Objectively, the money is just a sheet of paper, why? The paper is recognized by the state government to ensure that, so what is the guarantee? that is gold. Which country more and more gold, wealth assets are terrible, that currency is priced compared to other currencies. To understand more about currency you can see the book "War Money" nhé!
Bitcoin is generally accepted by the community and is priced against USD or gold so it's worth it.
In short, every value is converted into gold. But gold has some major disadvantages so new alternatives are available such as money and now Bitcoin.
Though gold has major disadvantage, bitcoin also had its own. Gold is not risky compared to bitcoin so they cannot be compared to whether the public will accept bitcoin and leave gold or the other way around. With the emergence of bitcoin in this era, golds value remains due to gold's less volatile price compared to bitcoin.