That kind of hubris always presages the fall. The failure of Wave, Google+, and things like this: Brin's flippant, cocky response to a valid criticism means that if I had Google stock, I would slowly start to sell.
They aren't new users though. None of them are new to google.com, and most already have Google accounts. They are simply activating another Google service.
It's a whole different thing if you launch a startup like Dropbox and get people to use it.
So by that metric, if every gmail user used G+ it would still be a failure? If it captured 70% of the online population, it wouldn't be that impressive because those people originally used search?
Wave was a failure, and it had plenty of Docs and Gmail users to draw from. G+ strikes me as a very different beast, and one that has already found its niche. It may not displace facebook, but it certainly seems to have eaten into Twitter's niche.
