Interesting idea.

One thing that this would be good for is almost by default members get experience working with the technologies the site is running -- they learn to use Github, deploy node.js, etc. It gives them a working technology base for their own projects.

One problem I foresee is that without a clear discussion about where the site is going, it could quickly become rife with lots of poorly-interacting features. Another is that delays in merging might well turn away valuable members.

Still, interesting project.