I think no one can replace bitcoin because if there is, it should already happened long time ago. We all kno that boitcoin is still dominating the crypto world and I think no other coins can do that.
in my opinion there is an Altcoin that has great potential so that later it can compete with Bitcoin because in the future technology is increasingly sophisticated so that Altcoin can compete with it. like Ethereum he is the best Altcoin that has great potential and he is almost the same as Bitcoin, but for now I think it's difficult to replace Bitcoin because Bitcoin is currently in the top position and he is the king of coins.
These two coins Bitcoin and Efir are the first and will remain the leaders in the world cripto. The rest will repeat them. And the point on this. The championship will be for them!)