Google has now become corporate, its keep on launching new products in market. Almost 3 to 4 product were launched last year like Google Buzz, but now they don't exist now. So overcoming to facebook wouldn't be easier, but my best wishes are with them.
I'm not sure that Google+ will be able to even dent the massive amount of traffic Facebook gets on a daily basis. While Facebook continues to make decisions that would seem to turn people away from the site(i.e. security concersn, the lifeline layout), not many of us have stopped using it. I don't even like FB that much, and I still log in everyday!
And when it's ingrained into your daily Internet use, it's hard to get people to change that habit and use Google+ instead. If Google is able to offer something that's much better and easier to use, perhaps it will gain more active users. But for now, it's a very distant second, and I don't think that's ever going to change.
I think that FaceBook could create a search engine within social network that bases it's search results on what it's friends or a larger group of people like. I don't think people will move to Google + for their social network, it's just too much of a move for people to start again.