Well, here we must first analyze the crypto market. Probably, some coins will grow very much in value and survive. And on some coins, on the contrary, demand will decrease and the price will decrease.
Yes it is, not all altcoins will rise high some of them will go dip together with it's price. Competitions at the market is very high, only those altcoins who has good projects and useful technology will soar high at the market.
The market is always falling and rising. I remember well that something that is very cheapened can bring a very big profit in the future, because the crypto market will not disappear and will develop in the future. At the moment, I would buy altcoins, because this can be a very profitable investment.