Do you think google + (plus) will hold up against it's well-established competitor, Facebook?

So, I just joined google +, and I like the layout and flow better than facebook, but so many people are used to facebook so I wonder if many of them are going to switch….will this be a passing fad, where a bunch of people will try it out but then stop using it? Will this be a facebook killer like facebook was a myspace killer? Please give your thoughts.

In case you haven’t heard, google+ is a new social networking site from google, recently open to the public (beta).