What support is there for hardware description languages? HDL is good for large projects and is more reusable than a schematic.
One suggestion is to have a component library that is shared among all users. Each person adds components as they need them, and the library grows, as a community resource over time. Maybe you have that already? If you do have it, what license covers the library? Is it covered by the same open source license as the schematics of the users that generated the library? In that case, is it free for any user to export and reuse in full? Such a feature would negate some of the "vampire" accusations leveled by the dangerousprototypes review.
What's the advantage over gEDA, gHDL or similar? Most people with the knowledge to design a circuit would also have the knowledge to set up a tool chain and repository. Who's the market?