i believe it is because of the pressure of certain people that they have released a new statement. and in that they are still too good! they've said they may add it in 2018! by that time this BCC is either dead or stable with less to worry about.
I think coinbase peeps are playing safe about this. They didn't add bitcoin cash to their system because they're not yet sure of this. That's why many exchanges are also not yet supporting bitcoin cash. Maybe they are not really believe that this will survive long term.
I think there is no option left to support and list BCC as all the big exchanges bittrex and now poloniex will be listing it and those wallets who do not support BCC, can get low on users and people needs all sort of option with them to buy and sell or exchange. I think BCC should be listed everywhere and then the people will decide its fate by buying or dumping the coins.