They are literally the biggest wallet provider. Do you seriously think their wallet will not in some way support Bitcoin Cash?
They will I guess but like you said they're the biggest online wallet providers and it's their responsibility to make their customers aware of their contingency plans .
As mentioned above, users can export their private keys anyway.
Apparently,only if you have an imported address and not the in-wallet generated one.
Locking the "message" feature on their facebook page means nothing.
I'm just trying to take randomness into consideration so I can establish a pattern as in why they didn't consider it necessary to make users aware.