Ethereum and IOTA will be representative of the bitcoin that can survive in the future.
They have a very consistent advantage and support from a vast community.
Ethereum is a good altcoin and it can survive in the future because it has a great features like smart contract will make the life of ethereum alive because there is a lot of projects everyday and most of them are smart contracts under ethereum so it will become easier for ethereum to stay longer since it has smart contracts that will sustain its life.