I haven't been able to keep watch over who has become inactive, as I've been rather busy with school. When next semester starts, I plan on going through and seeing who hasn't been online the longest that has a claimed territory.
The problem with more territories is that the forum is already quite large, with not many of them being played in. Wolf Life is not all about having your own territory with as many characters as you can, it is about team work, friends, and family. With everyone attempting to have their own pack in their own territory (some of whom already have one or even two characters that each have a territory), there is little opportunity for everyone to interact. If we get to the point that all of the areas are extremely active and "crowded" (such as a large pack in each territory that can be claimed), then I will look into adding more of them.