I don't think that we should look at the ETH and ETC coins
Today is a completely different situation. The Ethereum fork was kind of spontaneous, a totally unexpected event event by those behind it. This is not the case with Bitcoin now. Further, what is this Bitcoin Cash if not a fork by any metric? If they take the existing blockchain and clone, this is pretty much it. And in that very case the attack is inevitable, otherwise the whole idea is stillborn. Apart from that, how do you know that Jihan doesn't have enough hash rate? He might have been silently assembling an army of asics all these months
Before anything else let's see how much of their own mining power they devote to it. The money will remain on the main chain. If they attack that I really don't think people will be inclined to switch to a chain under the control of a handful of pricks who destroyed the original one.