well, obviously most will not survive, the same that most start up companies will not survive, also that is why it is so important to diversify the altcoins that you buy and hold
The point is what we call "survival". I see "survive" - to beat another coins and even non-blockchain corporations with product that was developed by the team. But there is another meaning of survival - get normal trading volume and liquidity. In second case there will be much more coins remaining - there is no troubles to fake liquidity when in first case - I think only 10-20 coins will survive and make something that people will use