As this diagram shows, most of the Google top managers are not very enthusiastic about their own products. Some of them, like the Big Boss Eric Schmidt, do not even have any Google+ account.
That is quite spectacular. Just as if Mercedes' board member would drive around in a brand new BMW, or Tim Cook would never even fire up his Mac.
I think, that dmitriy was right, when he raised the question about Google+ as a possibly failed or, I would rather say, stillborn project. Now even Google itself leaves us no chance to believe its social network is just experiencing temporary difficulties and is about to rise from the ashes like Phoenix.