in my opinion etherum will not be able to replace BTC because BTC is the first crypto born and the price of BTC can affect other cryptos such as etherum, so it is very unlikely that etherum will replace BTC.
The price in the cryptocurrency world is an indicator that changes very quickly. This will eventually affect bitcoin as well. It still keeps a high price, as many hope that it will grow in price for a long time to come. But its price cannot rise for very long. Economic laws apply to cryptocurrency as well. When this happens, it will quickly drop in price to the level of other cryptocurrencies, and then coins with many useful properties will surpass Bitcoin. It's only a matter of time before bitcoin continues to improve.
When talking about unstable cryptocurrency price movements, it all depends on demand in the market, meaning that when more people use the coin, the price will be higher because surely they will buy on exchanges at high prices, whereas if Ethereum beats BTC, of course it won't. will ever happen.