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Wrong, by this logic it would mean that gold should be dead because no one uses gold as a currency, only as an investment, and the other use cases are anecdotal, most of the gold is keep hoarded as a safe haven to hedge against a collapsing fiat economy. In this sense, Bitcoin can reach trillion of dollars of marketcap by this usage alone. Of course, if it's used in everyday transactions, that's cool too.
Stop comparing Bitcoin to gold. Gold has thousands & thousands years of history on Bitcoin, that's some first-mover advantage. And gold supply is not randomly and artificially limited, as is the case with Bitcoin.
A far better analogy (both in essence and timeframe) is
BTCeanie BTCabies: deliberately limited supply, impractical to use as money, were hoarded because "will maek me milionair!!!"