I see manipulation happening in BCH and because of it, Bitcoin Cash would not be taking over bitcoin. Also, I see that the current spam attack on block chain somehow is related with it. If ever it would, I think it would not affect other coins that much but it is a waste of time thinking about it because the chance of it happening is very low. I think that ETH is better than BCH even if it had surpassed it in price. At least ETH admin does not try to manipulate bitcoin to hype their coin.