In general, I have high confidence that we won't see cryptocurrency hitting zero. A selected few ( probably many ) will definitely hit zero level but not all of them. With the vast production of new alts every day many will perish and only the steadfast ones will remain. We will continue to see evolution of cryptocurrency since innovation is the trend of this world.
the possibility is very small if the crypto becomes zero, because the development of the crypto currency is already large in this world and the innovations made by many developers vary according to the needs of the world community. developments will always be done therefore the developer must keep innovating towards the user if they fail to innovate then the altcoin they make will be zero, this often happens to projects that don't do the maximum.