The community feedback within this thread captures my journey through the SourceCred idea almost perfectly. From the outset it sounds like a really terrific idea - reward community members who are openly active in the governance forums with financial incentives for their work.
Then, looking further into it, these incentives really just attract impassioned and well-meaning spam. In general, and this is true of all projects, brainstorming ideas is pretty easy. These message boards are brimming with stuff that could be worth exploring in future iterations of Bancor. The bottleneck lies after the crowd-sourcing of ideas: finding people with the skills and resources to translate these ideas into reality. Thankfully, Bancor already has a grant system to address this bottleneck, and so it remains to be shown if there is in fact a problem that SourceCred claims to alleviate.
In short, I think the community already does a terrific job of using Discourse to flesh out its concerns and voice new ideas, and something like SourceCred may just be adding additional overhead without making a significant impact on the ecosystem. This seems to be the conclusion at Maker.