There doesn't seem to be much activity in this group. Not sure what is happening in the background or whether moderators or interested people have left or something. Just wondering.
What Monica said. Mods are active, in fact, every mod has been active on the site within the last 2 hours as I write this. Question activity is just low. When questions are asked, there's an active group of people to answer them and support it, it's just a low throughput site, but has a healthy community. Just not a ton of activity.
I also have pretty little concern about the site every really becoming completely dead. All of the mods are multi-site moderators and work this in to their normal routine. (Fun fact, of the four sites I moderate, this one actually has the MOST active moderators.) There's also a good handful of core users who are active on multiple sites and similarly just work this one in to their routine. I don't see any particular reason that would change.
I'd be much more concerned if people came here with questions and didn't get answers, but as it is, questions get voted on and typically multiple answers are given, it's just there is a very low question volume, which honestly makes sense given the topic area.