At this point, I think Google should have more worries about antitrust. Google is very aggressive about bundling G+ with everything. I didn't want to get on it, but I was on gmail, Youtube, and a few of their other products, and they stopped working well without it. Once I was on it, there is huge social pressure to use it.
Google Chat, I didn't want, but it was integrated into gmail. Suddenly, I'd have chats from friends pop up as I was working. I presume there's some way to unbundle, but at this point, it's too late.
List keeps going. Google is crushing competitors not by building better products, but by using search to steer them there, and the rest of their chain to force users into them.
Google's motto seems to have changed from indexing and organizing the world's information to hoarding, organizing, and locking down the world's information.
Like Microsoft, they're also getting less and less competent. 6 years ago, their software was phenomenal. Today, it's kind of below average -- they've had a huge brain drain to startups, Facebook, and other places (except for Google X, which seems to be poaching quite well).
It's not as bad as Microsoft in it's prime, but it's getting there. I think in a year or two, they'll actually be worse.