According to this article, Google+ traffic is falling.
No surprise here. Personally, I’ve found it to be rather boring. Perhaps its because many of my friends aren’t yet on there, or maybe because the few people who are aren’t particularly active, but whatever the reason, I’ve found it to be much less engaging than Facebook or Twitter, despite the fact that it’s sort of a hybrid between the two.
Will it pick up? Probably, Google basically runs the internet. Then again, maybe not, who knows?