Well, that was a given, coins will come and go, that's how this market works, but I'm pretty sure most of them will be ongoing even though they cost close to nothing, that will be the market.
In the future a lot of tokens are going to be pegged to be able to use them as a currency and the price fluctuation is going to be controlled for easy methods of payment for people in the crypto field to get paid.
Failing of cryptocurrencies in this context probably means that they just won't go as high as the rest of the main altcoins that will likely to succeed.