Bitcoin, as the first cryptocurrency, is irreplaceable. Although digital currencies have continued to increase in recent years, the most valuable thing is Bitcoin, so I don't think Bitcoin can be replaced by other cryptocurrencies.
Yes true, bitcoin is the first cryptocurrency and can be said to be the mother of all coins, when bitcoin price drop then the price of all coins will drop, bitcoin becomes the size and standard price of all coins so it is difficult to replace bitcoin with any coin.