we can assure that bitcoin will never be replace by another cryptocurrency because bitcoin already has large network and a large number of people and huge amount of dollars has been invested on bitcoin also it already has a very large market which is spread to many online community .
That's right, though it wont be possible for any other currency to replace bitcoin but as it is unpredictable so we can't really say this for sure that bitcoin would live forever as it is digital and anything can happen to it in coming time.
I think bitcoin will stay on the top of cryptocurrency. It maybe unpredictable and fluctuating much, but it is still the best cryptocurrency so far. If it will be replaced, it will be replaced by an improved bitcoin with faster confirmation and bigger blocks.
Basically all cryptocurrency have something good things. but lately, giving us something that is bad, because there is indeed something problem faced by all cryptocurrency. However, if in the view of what is happening, then the bitcoin will not be replaced by other cryptocurrency. because the bitcoin is a currency that has given greater advantages than the other and also cryptocurrency now the price and also the user's been growing well
So far there is no altcoin are still doing it so bitcoin still in the top because more use and stores are accepting bitcoin and more adoption will come according to other said.. that can affect for value of bitcoin if more investors will come..