I bet it will drop to zero in a few years. Especially when second layer solutions like lightning network and different privacy features will be implemented to BTC. Bitcoin cash is just a piece of shit and it always was so. 
It is very unlikely that Bitcoin Cash will become completely worthless. The reason why I am saying this is ever since its creation from the hard fork in 2017, BCH has managed to get backing from some of the most powerful people in the crypto-world and it has slowly but steadily built a dedicated and loyal community. Transaction fee is not the only issue that lead to the creation of BCH. According to Roger Ver, BCH is closer to Satoshi's coin when compared to the current BTC. And if I am not wrong, BCH mining is more profitable right now, when compared to BTC mining.