Django’s open source debut was in the summer of 2005. At that point, we had three full and one partial committer. Since then we’ve had major contributions from hundreds of developers, bug fixes and patches from thousands, and input and engagement from tens of thousands. Yet last week we added only our fifteenth full committer.
A "full committer" is someone who can add/change/delete code to any part of the project by themselves. This illustrates how collaboration around a major open source project is different than, say, a wiki, where often everyone is a full committer.
I think open educational content should be handled more like software than a wiki.