I dont think that bitcoin will be replaced by any other cryptocurrencies like etherium in the near coming future because since bitcoin has started it has gained immense amount of popularity and reputation among the people around the globe.
Yeah I don't think that it will replace bitcoin, we have seen Ethereum before claiming to be the best thing and that it had a bright future yet they got hacked and a major flaw in its security protocol were breaked. Now it is fixed but this tells us that Bitcoin hardly can be replaced by any other crypto currency. And even if that happens we switch to the new one but this for me is not going to happen.