Like they say, you can always tell if a google code project is active if it says "we've moved to github..."
Github just needs a "Google Groups" without the spam and they're set.
I'm getting really disturbed at this "if it's not on github it doesn't exist" meme. In the past it was "if it's not on sourceforge it doesn't exist" - what's next?
However, Github makes it very easy to inspect both the source code and the activity around the project. To me, the community that is developing around github is just as important as the code. I don't find that disturbing. I also like what Bitbucket is doing for what it's worth.
Sourceforge, Google Code and a lot of other hosted solutions rely on advertising to make money. They're trying to sell clicks from a click-averse audience and it affects the service. Github is paid for by developers who want great tools. I won't hold it against a development group for picking something other than github but I think developers who want good tools will migrate there. I won't miss sourceforge. If it were merely a fashion trend, I would agree with you but I think github fundamentally changes the way you interact with code.