This is great. At a minimum Google+ could become like the Chrome browser. It might not attain a dominant market share position (though Chrome already has a higher share than IE on this site, and others, with a tech-savvy audience), but it could push the edge of innovation. I don’t have a problem with Facebook, but with the collapse of MySpace years ago it has had a de facto monopoly in the general social networking space.
Finally, an anecdatum: a friend noticed that six of his contacts deactivated their Facebook accounts in the past few days. He didn’t know why, but there’s a high probability that these may be the types who just want to start over like Ezra Klein suggested.