I don't think so. Some crypto will soon cease to exist since some of them will loose investors as their value go down. That is why you should be smart upon picking on which crypto you are going to keep on investing in. Bitcoin is most likely to survive since it is very powerful and it is the pioneer of cryptocurrency.
If a crypto coin value goes down, that doesn't mean it can't or will never get to recover. So far the project has a well adopted and working product, It would only be a matter of time for the coin to get back to the top in terms of value, As you'll see some tokens lose value drastically on hitting an exchange, most times due bounty hunters selling at almost any price, even some early private investors do cash in on the their 30-50% profits by selling at ICO price. But, after some weeks, maybe months or year you'll see the coin recover tremendously.
I always pay attention to whether the project has a finished work product, it gives me confidence, and I trust this project more. Accordingly, I am in no hurry to sell coins of this project.