Bitcoin itself won't be taken over/replaced by a different cryptocurrency unless there is some major shift with the cryptosphere or a lot of the fiat financial systems start to move into cryptos and everyone pushes for a new one.
Bitcoin can change and be modified, but there's a very small chance that Bitcoin will be replaced in the foreseeable future.
I don't think that bitcoin will be replaced, but I believe that we will have more cryptocurrencies which will grow high and it will make profit for a lot of smart people.