Highly unlikely that bitcoin is ever replaced by another cryptocurrency.
Bitcoin is the only leader in cryptocurrency. When the price of Bitcoin goes down all other coins crash. When it goes up all other coins go up.
Ethereum follows this pattern too.
I see this and I understand why because bitcoin is the trading pair for almost all other coins. However there will be coins that you will be able to purchase with fiat and do atomic swapping of other crypto currencies that will break away from chain gang of bitcoin, and I am on that train. where do you want to be?
https://electraproject.org/