coinbase is just like other exchanger, bittrex, poloniex etc nothing to worry about it. Adding etherum on their list because etherum is one of the popullar alttcoin like other exchanger did, I dont think that it will threat bitcoin at this moment, it might be, once the etherum's price same or higher than bitcoin's price.
I'm not sold on that viewpoint. Coinbase is the first port of call for many people getting into cryptocurrencies and their fiat links make it more important and 'legit' in the eyes of customers.
They also have serious marketing muscle compared to alt only operations as their remit is to pull fresh meat in. Ethereum being pushed by them is a big deal however you want to look at it but I think it's a pretty reckless move on their part. I sure as shit wouldn't be adding a freshly forked coin that may or may not become pos sometime soon.
Do you really think enough people want ETH ? I don't think so.People should actually start giving up on their shit coin ideas because the market is just not ready to accept change.I'm talking about general merchants here,they're still trying to promote the use of bitcoins and accept it's mass adaptability.
Deep down I don't think most people care what they buy if it makes them Rich. Right now it's the alts where the action is. Greed will cream anything else every single time even if it kills the entire scene off.