At the time of this writing (17:47 UTC), BTC is -15.74%, ETH is -19.76%, and BCH is -20.89%. In fact only 3 coins of the top 100 coins and tokens listed are appreciating at this moment. Coinbase's offering of BCH might attributes to prices coming down. However, markets have the possibility of rise as the Emperor's Birthday and New Year's Day will bring idle hands back to the market.
BTC has been in a veritable slump for 5 days now. Though investors may get the hint that the cryptocaplyse is upon us, many other investors believe that BTC and other cryptocurrencies will rise by year's end 2018. As novel investors enter the BCH space, BTC will become more and more of a bear, while BCH takes the bullish stance. Still though, no coin, due to lack of community and exposure to the market, has performed the way BTC has. Only time will tell about BTC position in relation to BCH