Actually there are many coins that might survive in the future but Ethereum is the best one I think. And also litecoin, neo, eos, waves and monero are the coins that I trust most. I hope I wont be wrong in the future. Because I am holding these for very long time.
In my opinion, I think in the future there will be limits on the creation of the altcoin on the crypto market. Since too many altcoins are born, too many altcoins are of low value. The market will continue to exist strong altcoin such as BTC, ETH, Litecoin, NEO ... etc