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
You seem to heavily underestimate these dudes
If you don't think of them as complete idiots (which they ain't), you should expect that they have calculated everything well enough to be certain of success. Why would they want to fork off if they weren't going to succeed? Further, they are not going to attack Bitcoin directly, they have artfully managed to make users pay insane fees before, so what makes you think that they won't be able to tacitly beat Bitcoin into oblivion, which is what they will certainly do? Many if not most people here are exclusively for profits, and if they see the original Bitcoin crashing, they will be eager to sell their coins for this new Bitcoin (whatever name it might have)