Since bitcoin has finally pushed towards 2x segwit, bitcoin will be around, ETH should be around but not as a trading coin. Since ETH is a fuel for applications on the ETH system. As for other coins, any coin that provides a service that is accepted by the worlds use. Coins are like products, if the product is used by people in the world, even in a niche it will survive. But if a product is not used or does not make a profit is usually removed from the marketplace. There are coins that exist now that most likely will not be around 5 years from now but as to which exact ones? I don't know.