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.
Yes I agree bitcoin future is hitting its heights peak for now. We can see the drastic change of value and price of bitcoin. So in the near future more opportunities will come and develop for the bitcoin transaction to upgrade. And if we think it will be replaced by other crypto currency for me it is very evident the it is impossible. Because the community and support of users of bitcoin is also increasing as its function develop. So for me the best conclusion is on upgrading bitcoin for the better rather than replacing it.