[xentronium]

As a moderator of a wiki-project, I can confirm Aaron Swartz's results. After we had gained enough popularity, most of the articles were written by outsiders and core community was there only to maintain -- categorize, wikify, create interlinks here and there, delete garbage and, last but not least, have flamewars in the discussion pages.

[sliverstorm]

It's only logical- the people best suited to write articles are people who are well-versed in the subject, and the core community can't possibly contain experts on every subject.

[ErrantX]

I'm not sure that is always accurate; WP simply summarizes content available in reliable secondary sources.

For most topics it is possible to do so without expert knowledge. Of course; some areas have always needed experts to write. I'd never touch a medical article, or macro-biology, for example as it is all double dutch to me :) But, say, history is often easy to write if you have the source material.

[thewordpainter]

100% agree. the core community needs to scale with the number of pages that are added every year.