Even though we had a steep Bitcoin price drop after the Bitcoin Cash hard fork, I'm sure you're still right today! Bitcoin cannot go to zero because too many people believe in its value. Over the past year Bitcoin went down, sure, but it will stabilize in 2019. With more implementations for Bitcoin payments, more people will get involved and more people will buy and trade Bitcoins.
https://www.hardforking.com/can-bitcoin-go-to-zero/