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Even if we find thousands more tons of gold, I am sure it will never lose its value, and the price will still increase over time. The demand for gold is huge and the use of gold is not only for investment but also for use in all industries, daily life...while bitcoin is just an asset for investment and speculation. So comparing supply and claiming bitcoin is superior is not convincing.
Apart from being an investment platform which was actually not the primary purpose of creating Bitcoin, do you know that Bitcoin is used as a legal tender? If yes, why then do you think Bitcoin is just an asset and speculation? Bitcoin demand now might not be as high as that of gold for some reasons and one of the major reasons is that gold have been known to humans even before money came to existence so gold is literally known by everyone as a good asset for investment but the rapid growth of Bitcoin as a digital asset project since the creation in 2008 should tell you that the future will favour Bitcoin more than gold. Bitcoin is a digital asset than can be easily transferred from one place to another in less than 5 minutes but gold transactions aren't that seamless and considering how digitalized the world have become and still becoming, it's obvious that Bitcoin in the future will surpass gold
The original purpose of bitcoin is no longer important, we need to adapt to change and accept the reality that is happening. Bitcoin is being used as a speculative instrument rather than a currency and has no potential to become the world's official currency.
The world is slowly becoming digital but you forgot one thing, the world has evolved over thousands of years, there are thousands of new technologies being created. But the interesting thing is that tangible assets such as real estate, gold, black gold...always play a key role in any stage of the world. As you said, gold was known and used by humans before fiat was invented, which means it has been recognized by humans for thousands of years. In those thousands of years, no asset has ever surpassed it, so what guarantees that a speculative asset that is only 16 years old will surpass it?
Bitcoin surpassing gold is essentially a baseless expectation of Bitcoin investors, with no basis, data, or with what has happened and is happening to show that it can happen. As investors, we have the right to think about what is good for bitcoin, but we should also be realistic and not be too delusional.