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 agree with the statement, but wonder whether this is already happening. Is the boom of altcoins and ICOs consider some major shift with the cryptosphere?