I think that 95% of crypto coins and tokens won't survive and the reason is that a crypto coin in order to survive and get value it has to be accepted as a way of payment for purchase goods or services.
Very few coins will manage to do it at the end of the day and of course these coins will get enormous value.
The only thing you have to do is to find out which coins will enter the market of real currencies.
I already read your idea somewhere here in the forums with that exact percentage of coins might not survive the market in the future, anyway i think so too, there's a lot of crypto from the past that has no trading volume, i believe a continues development might sustain the life of a coin with this harsh market condition and proper selling of the news of the coin will make it stay alive.