I think it is hard to imagine the crypto world without bitcoin and despite what people said that bitcoin may not survive, I think it is here to stay. But IF bitcoin continues to fall and it does not survive, which of the alternative cryptocurrencies do you think can take its place? Ripple? Ethereum? EOS? Will it be bigger than bitcoin?
Like you said, it is hard to imagine what the cryptocurrency space will be like without bitcoin, being the center of all crypto activities from trading, to investment to whatever, bitcoin is always going to be involved. In this case, what would make bitcoin not to survive will actually possibly affect every other cryptocurrency if you know what I mean. So, in that case, I still see no replacement. Even if there would be, not from the ones you even mentioned.