the crypto money world has become very popular nowadays. everything is in a very variable market. some altcoins projects will surely be in the future. but some altcoins are condemned to death.
I suppose, in future, there will be even more altcoins than now - simply they will be different. As for the existing cryptocurrencies, I am sure that Ethereum will survive. The other alts-survivers will be NEO, Cardano, TRON, and Stellar, DASH, and Monero.