From my past experience concerning the crypto market. I don't agree with the saying that most crypto currency will crash to zero because the market will recover as from next month.
The whole market? How can you be so sure? I see a connection between most big altcoins and Bitcoin, but not all are following it. You can clearly see that LTC is going down at the same time when BTC but take a look at ETH. It has it's own mind and sometimes goes up while the rest is down. I think most cryptos will eventually go down in value when the boom ends. We don't need thousands of coins especially that most of them don't have any special features.