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I think it's because we've all but lost several major contributors due to time consuming jobs. The problem is every major contributors stimulates more conversation than just what they write, so the effect of losing a few is pretty big on a site this small.
Yeah, for me it's work and life consuming most of my time. I'm writing an academic paper based on my thesis as well, and I notice it's not easy to find the time for that. But I have also drastically cut down my time on Reddit, Twitter, HN, and reading newspapers which has limited my exposure to cool things to post here.