I think bitcoin will not be replaced with another cryptocurreny, because if we have to look at the btc price right now; no other cyptocurrency beats it's price. Comparing it to ethereum today, it has nothing to do with price competition which mainly other people have compared it and also speculate about bitcoin's death in the system.
Yes other crypto currency will not replaced bitcoin because the price of bitcoin is very rise and high as compare to ethereum and other crypto currency , and in bitcoin many people has invest money, many people has also do trading and daily wise bitcoin is going to popular as compare to ethereum or other crypto currency and I do not think that other crypto currency will replaced bitcoin.