I asked what I should do with the unactive admins on theEmoticon Wiki and Merrystar said this:
Hi. Generally speaking our advice is to just leave existing admins in place. They aren't doing any harm and they may come back sometime and help. You can "follow" their message walls so you will know if somebody mis-posts to a question to them. If you really wanted to you could also place an "inactive" flag in their header -- my guess is that somebody in our forum could help you with that.
While we discourage it, it is allowed to request that the rights get removed. To do so you will need to hold a community discussion and then send a link to the discussion to Special:Contact.
I was wondering how to flag an admin as inactive as I need to clear up a bit on the wiki.
Thanks,
Oxygen720