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?
If Bitcoin died then it would be a death for the whole cryptocurrency sphere. Imagine this situation. All people would start to withdraw their money from altcoins, including Ethereum, so I think that nothing can replace Bitcoin. Maybe later, they will try to reanimate it but nothing will happen.