I think that the only ones who will survive for all the entire 2018 would be those who are those below top 70, the others are just dump and pump coins, that probably have no future.. It is how most ico's works, they start from zero, and then they go to moon, but obviously they will fall in some time, that is why we have seen a lot of altcoins who were in top 10, that are below top 100 right now.