I don't think that all the encrypted coins will survive. I think that only 70% of the cryptocurrencies will continue to survive, because every day there are new technologies and new coins. Those coins that are not so good will definitely be squeezed. of
Of course not, most of them will not be needed by the world, and accordingly if they do not find their application they will not be needed by society. There is also a high probability that the coins will become a scam and that you understand will remove it from the market. So many krypto coins do not need, everything will eventually form.