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I don't wish Citizendium any ill (the more the merrier), but I think the whole reason that Wikipedia has so much more content than (for example) Encarta is that everyone is encouraged to contribute on the basis of the quality of their contributions rather than the quality of their 'credentials' (most of which are probably more than a decade old). In other words, people (including experts) who write quality stuff on Wikipedia are very welcome, while people who write rubbish are not.
Unless Citizendium is suggesting that it would seek out and welcome people who write rubbish just because they claim to be 'experts' (surely a recipe for disaster) I don't really see how it will attract anyone on the basis of its content (especially since any decent stuff that it produces will be re-merged into Wikipedia, perhaps even by a bot) - all it will do is attract people who want to give themselves a sense of importance by telling 'less expert' people what to do. An expert-focused wiki is a good idea, but since 'experts' are given more control than 'non-experts' then it seems likely that no 'non-experts' will be interested. At which point Citizendium basically becomes Nupedia without the peer review process.
Cynical