I highly doubt it. There are countless times when companies have rolled things out to everyone and it caused problems.
The irony here is that Facebook has failed this way many time and here google is trying ot compete with facebook with buzz and did exactly the same thing.
Google is full of regular people and they make regular people mistakes and will continue to do so.
That's not ironic. People have very different expectations between Gmail and Facebook.
When I used FB I expect that my news feed is public to my friends. It's used for open social interaction. The same goes for Twitter.
When I use Gmail I expect my emails and contacts to be private. I don't expect strangers to see what I'm doing.
The user's experience and expectations are different. This is why Facebook has more leeway (but they still get * if they do something that opens up your profile to the public).
