Google+ Is Dead by Farhad Manjoo
"The search behemoth might not realize it yet, but its chance to compete with Facebook has come and gone."

While I don't like all of the changes to FB, I think the company was smart to copy the better features of Google+. Maybe they didn't think they had much of a choice at the time. But I don't foresee a mass migration to Google+, unless FB does something to severely alienate its users. This predicting may all be pointless though, if the economy implodes and takes both companies down with it.