I don't think crypto as a whole will go to zero value, but I think there are some crypto coins that will definitely go to zero because of no development of the project, investors will pull out their money if the certain project has no improvement.
Me neither. Crypto going to zero, is just FUD by naysayers in the mainstream world. For what I've seen, crypto is here to stay. Bitcoin has become too big to fail, with years of active development and innovation. As long as it remains decentralized, nothing should be able to stand on its way. This means that Bitcoin and some other prominent cryptocurrencies will retain their value on the market for the foreseeable future. Old coins like Ethereum, Litecoin, Dogecoin, and Monero, have greater chances of surviving in the long run than newer ones. People already trust them more than anything else. With an open source and decentralized nature, anyone can revive defunct coins in order to make a better version out of them.
Nonetheless, it's safe to say that crypto will never go to zero. While there's no denying this, some altcoins will simply die in the long run as their developers abandon them. This will cause prices to go to zero across the market. As long as you invest into the most prominent cryptocurrencies in the crypto/Blockchain space, there should be nothing to worry about. Just my thoughts
