@Thomas_Iguchi - I think a better metric than "Number of questions asked on StackOverflow" might be "Number of queries run on StackOverflow" - if the subject has reached or is near reaching Q&A saturation then StackOverflow becomes less of a place to ask questions on the subject & more of a place to search for questions that have already been answered. Does StackOverflow publish that kind of data, I wonder?
That's interesting... I'm not aware of recorded search queries, but I agree that should definitely complete the picture. How often do people actually search for specific questions and answers. Or a related metric: how often are Q&A's up or down-voted or commented on. Any kind of activity would give some extra insight.
I think this might be possible by using the StackExchange API
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