This is unlikely to happen. I think that, over time, Ethereum will be able to surpass bitcoin, but not BitcoinCash. He's not in the market much to think about.
yes, bitcoin cash is a newly emerging coin type and the price movement is still far to exceed the bitcoin value. if we look at coins that always coexist with bitcoin (ethereum) already trusted by all ICO projects, ethereum also requires a long process to be aligned with bitcoin, but ethereum price movements will always be under bitcoin.