Not all altcoins will not survive, it is true that there are altcoins that will die as they are on its business , but there are altcoins that will also survive and will be stable when the time comes to their maturity and survival in the crypto currency world , so there are altcoins that will vanish and some will be retain.
Actually some altcoins is on way of their success, maybe some will not survive and will be gone but there were always be a great that will survive, i hope that the altcoin that i bought will be the great in the next more years