I'm not ready to predict failure for Google+ - I realize that they're not aiming for me, they want "Everyman" to adopt it. I'm oftn surprised by what works for the average user and what they reject. Some of the innovations in search results didn't look all the good to my eye, but average users seem to either ignore them or even like them. It might well be the same with Google"
I'll bet Google was a bit frustrated to see that tecchies and marketers were early adopters rather than more run of the mill population. I'm not sure how they're going to reach my family, but it's not likely to be through me.