It seems a far easier strategy to create a social service where identification is a presumed requirement, and then sprinkle a bit of that across all of the other services. By 2011, half a billion users had been trained by Facebook that logging in with your real identity was the norm. After all, all of your friends were doing it.
Thus, Google+ was born. It was the first time that all of Google made a consolidated step toward identification across all of their services. It was a rally point internally and externally, was easily understood, had a clear product roadmap, and opened the door to all kinds of new, stickier products.
I think that the expectations of G+ being a Facebook killer were misguided. Google would love to replace the FB News Feed, but I think it's already achieved much of what it set out to do.
Fast forward this is officially FourSquare rip and FourSquare is officially going to die.