These coins are volatile. It means that these coins cant be predicted when it will fall and when it will rise again. The idea of coins that wont survive is its because of the quality of that coin. There are many coins here in the market and maybe half of them is useless. The coins that doesnt have potential to grow will surely end. Some developers also created useless coins just for them to have a profit and will abandon the project and will do the same thing on their next project.