Maybe. But many of us are early adopters on Google+, because many of us are early adopters of all kinds of technologies. How effective have any of us been? I've got a ton of connections on Google+, but they're mostly other software developers or enthusiasts. All my real friends who are actually on Google+ created accounts and then apparently forgot they had them and never post. Probably because I'm the only person they know who was using it, and as awesome as I am (jk), one person is not enough to get someone to use a social network.
Our early adoption tendencies pair with a tolerance to nerd out over multiple competing systems. Studies have in the past suggested the average smartphone user only uses a few (5, 6?) apps that they've downloaded with any sort of regularity, the idea being they just don't have the time, patience or desire to check in on 6 different social location-aware deal apps.
Facebook is, generally, a better experience for a person that wants to keep up with their friends, because posting, discovering others' posts, organizing groups, having get-togethers in real life are quicker, simpler, easier for the general user.
So they'll ignore Google+ because they don't need that second social network if Google+ comes in second.
The thing is that g+ was pretty useless for early adopters because it lacked so many features - an obvious were events, it boggled my mind that Google had Google Calendar which syncs to every Android device, but g+ had no means of creating an event for almost a year.
