Both ethereum and bitcoin will further develop and exist in the future. But only a few altcoins will exist in the future, now very many will die and will forget about them, since these are just empty cases.
It is still difficult to say how the cryptocurrency situation will develop in the future. The current fall in the price of Bitcoin will leave a noticeable mark in the development of cryptocurrency. Investors will disappear euphoria about the constant increase in the price of Bitcoin. Probably, no one will claim that Bitcoin is digital gold after such a sharp drop in the price of this "gold".