Post activity swings but the long term moving average is trending up. The last few weeks were a down cycle, which might be what Jist is seeing. The down cycles happen every other month or so, and it's always been this way. Posting and general traffic is also seasonal and has been for the 17 years of GDNet. We're coming out of the down period for that as well.
Readership is way up. A lot of new visitors as well (new users has increased 15% in the last month).
I'll need to dig into the data to capture more specifics about which areas are more popular than others, but the idea that this community isn't as active as it used to be couldn't be more opposite to the data I see and monitor every day. Certainly, we have a lot of room to grow to adjust to the industry trends, but GDNet is very much a growing community.
We are making a lot of changes for growth, but if you want to directly contribute to that growth then spread the word: send out links, post things you like on Reddit and other places, send out tweets, whatever you like to do. The community is only as strong as we make it.