there are useless altcoins that will naturally die, but there are also valuable cryptocurrencies with excellent technologies, such as ETH.
Usually the coins that are easily to die are those shit coins, their project is a pure trash, their team is worthless and doesn't even care about their project to go for nothing. Having this kinds of altcoins is heartbreaking, you put a lot of efforts in their bounty or airdrop but at the end, you didn't know that their project is all for nothing.