Wrong I think. There are already several Djangoids looking at making a discussion forum together as an open project. I expect there will be plenty of similar activities.
The problem is that Django is changing fast right now without regards to backwards compatability. Wait until 1.0 hits and soon thereafter I expect that we will see more app sharing and cooperative development beginning to take place. I should also add that I don't really like many of the stated conventions for creating sharable apps. The insiders at LJO don't follow those conventions and I doubt many others will bother. IMO the area of app deployment needs more attention and perhaps some additional automation support.
