It will be interesting to see what Coinbase will do next and how circumspect they will be after this crazy BCH rollout.  They did make it very clear that they were going to add support for BCH back in August, but they did also say that the support would happen after the first of the year, so this early rollout took everyone by surprise.  I wonder if it is inevitable that, whichever coin or coins they support next, we'll have the same craziness and price swings.