Depending on the use case of the coin and how the teams promote the benefits of their coin. If they keep to developing new product and follow the trend of market, they will be survive from the market, because the interesting of the project increasing. Let see old coin of Cloack coin, the price still in the bottomed although the market on bull market because the don't have others products that interest to see. With high competition on the market, more altcoin can be dying.