In comparison to a potato, Bitcoin is not even a physical tangible good that can be used for satisfying human wants or needs, and its only utility is that it functions as a medium of exchange. So, just because Bitcoin supply is limited, that does not mean its price will rise. People will NOT pay enormous amounts of money just to have a medium of exchange function, especially if this function is equally available whether the price of Bitcoin is 1 cent or 7.000 dollars, and if this function can be realized with various alternative cryptos or fiat money.
Supply depletion is not the main cause of price inflation, demand influences it also. If the supply keeps reduced and the demands are low it won’t create inflation. Then the usage dependence, in this case Bitcoin, won’t be as simple as changing it to altcoin even to anything else. The huge amount of altcoins could break the market so there will be no market centralization could make transactions difficult.