The market has realized most of these coins are worth nothing and the promoters have no intention of developing the ecosystems
Like what happened in the dot-com bubble it will probably happen sooner or later in the altcoin ecosystem. I don't know when it will happen but as soon as it does, 95% of all altcoins will be worth $0.
I hope that I'll make the right choises before it happens and hopefully I'll have most of my money in the 5% that will prosper.
95% of coins will disappear, the problem is knowing which ones and when. Others could transform or get bought by the winners, not losing all value...