The denomination doesn’t “change”; the currency becomes worthless. Every single unbacked form of value in human history has ultimately faced obsolescence. From the clay tokens of Mesopotamia to the cowrie shells of ancient China, any medium of exchange whose supply can be easily expanded (whether by a central authority or changing trade dynamics) eventually inflates and gets abandoned for a harder, more reliable medium. The dollar and Monero are no different. Once the fiat experiment runs its course and all 21 million Bitcoins are mined, the network will no longer rely on block subsidies. If Bitcoin remains decentralized and secure, it will sustain itself purely on transaction fees. The cost to transact will be determined by a free market bidding for block space, completely decoupled from the whims of an inflationary printing press. This is because a real free market is actually deflationary.

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I don't think you understand the point. For bitcoin to survive from fees alone with 7TPS, it means each mainchain transaction will cost roughly a month of salary whatever the denomination is. We already know that cause we already know the cost of mining a block.