Yes, it is true that some coins will not last long in the sense that other coins in the cryptocurrency will die, such as degocoin and tron ​​etc. but there are still coins that will last long and can even be long-term investment coins, such as Bitcoin or Etherum. Even though the crypto market selling price of the coin is down, it's only temporary. In the next year the coin will rise again. A situation like this you have to be more careful in choosing the coins that you will invest right.