U.S. Facebook engagement was actually dropping in 2011 and the Zynga games were the reason why. People hated those games.
Google+ could have gotten some more air time with that idea. What they did with it, I can't predict. Sometimes, more air time means not crashing; sometimes, it just means crashing later. It would have had a chance with Real Games, though, and I'll take "a chance" over "no chance" any day of the week.
Anyway, I'm glad that Google lost. A closed-allocation company with stack ranking deserves to get beaten. So there.