Some may disappear, yes. But that was happening anyway, not all coins will have longevity as many don’t offer anything new to the space. That being said, many more come daily. Many will rise, even more will fall!
All in all though, the current state of the market (IMO) is our own doing as there is MUCH more positive events taking place then negative as well as the beginning of adoption.
The market should be rising, yet all the “weak hands” are making it fall