Either Bitcoin will be replaced or survive but Bitcoin will definitely have its loyal users, for now there is really no reason for users to leave Bitcoin, so in the near future Bitcoin will still lead the crypto market. Talking about the total market cap, Bitcoin is who topped the position, to beat it seems easy but will the market do it? This is our homework and especially developers to keep it in the market cap remains the number 1.
Bitcoin cash also can do the same but it takes some times. Who knows this year ETH lead bitcoins.No one know what will happen but i have big hope with this number one ranking coins that it will be up and always in number 1.