Icaruspedia is reasonably active, there are some days where we will have 10 edits, some days where we only have one. In terms of things to do, there's a handful of extensions that need installing which have not yet been installed, but only one user is able to do that, and we have a lot of weapon and AR card articles still to make.
We do have spam accounts registering, though at a much lower rate than what it used to be, and the wiki gives clear instructions on how to hide the spam. Still, this Assira may be worth installing.
For active users, we have one user, who is also a patroller, IceBlue, who edits almost daily, four members of staff that check the wiki daily, who also edit, and we've got about four standard users who make edits at random.
All in all, we aren't going to drop into inactivity any time soon, though our current activity may not last forever.
Being Lylat Wiki staff, I can also comment on the activity of that: Yeah. Not too smashing. 0 edits per day, 0 active users, primarily because it does not exist at the current time. We've even had our domain snatched. But I do believe that Tacopill is making progress on getting it back up, albeit with a new .info URL.