That's the simple truth, some altcoin will not survive in the long run because there is no real use case for their project, there are some project that does not actually requires a blockchain but you see a lot of people doing it just to make money from the people. so with time such project will not survive.
not all altcoins can survive and among altcoins there are also those that can survive. depends on the potential and strength of the coin that can survive.
not all projects succeed depending on how you handle them. then choose correctly and understand in detail.