It hasn't lost souls, it's possibly "lost" member, however we are at a time of year when members would be a little less common.
From the start of school to a few days ago many kids are in school, from a few days ago to a few days from now many adults are preparing for Christmas and other holidays, and from the end of the holidays until the end of school kids will be back in school. That's allot of the members right there. We'll probably see another boom in the summer.
As for the covens, new covens can't be made and the old ones either don't have anything new to advertise or simply don't need any more members.
The mods, if they don't do their job they'll probably be removed otherwise they may leave if for some reason they decide to leave the site. New mods would be made when the moderators we have now decide a member is ready to be promoted.