One of the most amazing things about Google Plus is …
… the speed at which the content gets indexed by Google (and by Bing too, but that is another story). You add into that the fact that your content ends up in Google+ search (even if you haven't been circled) and can even show up in Google News – we got something very interesting here indeed.
Now, the argument of the "Google Plus Ghost Town" goes away if you realize the potential for discover is considerably larger than whatever audience Google might actually send your way via their social network.
Of course, if your Blog just automatically picked up your Google Plus content, you could truly have the best of both worlds.