Kim van der Linde wrote:
What I do know is that experts have in general a short life span at Wikipedia (if they join at all), and that is not going to change.
That's not my experience---hundreds, if not thousands, of Wikipedians are experts in a variety of fields. I'm a PhD student in one field, and will presumably still be a Wikipedian when I have my PhD (and am already an expert in some sub-areas). I know professors, graduate students, lawyers, game developers, engineers, and a variety of other professionals and experts who edit Wikipedia. In fact I'm often surprised by how often I recognize the names of Wikipedians from elsewhere.
-Mark