I was a fulltimer there around the same time, and I agree. I ended up quitting fairly soon after the G+ real names fiasco blew up, and it felt like a lot of internal "social capital" got burned on that, which was never really recovered.

I don't think the whole place went to hell at that moment, or anything, and your description is maybe a little more dramatic than I'd go with, as to the role of G+... but it definitely seemed like one of the big turning points.