Wikimedia Foundation planned a few years ago to open an office in Brazil, one India and one in the Middle East, but it has given up of this trial for several reasons.
I think before thinking about the idea of this thread, these cases should be seriously studied, inclusing some possible problems and challenges that can raise when you have far workers from different culture doing a work led by an Americo-centric organization (that was, at least, one thing pointed out by some consultants during the last all staff meeting, if I undersstood well).
And I think there is a good point about WMF office being in SF for a global organization. Its timezone is one example. What about the price of the city? But that would be a long discussion and the actual structure of the organization wouldn't allow this to change anytime soon.
Now that we know that Internet in US is as safe as in Chinas (:D), maybe an office there would be a good trial? :)