Sorry, I've been meaning to respond to this but life has gotten in the way.
This is an issue, however, where you may believe that some of my inexperience is revealed, but you can ask Sirnick, Dereich, or Lumine for more clarification, as we all agreed on the solution.
The other benefit of reregistration that we discussed is that it allows us to redraw the map without looking at current populations. Making all this effort to solve regional inactivity won't really matter if we create a monster Midwest-Pacific region that ends up just as inactive as the Pacific and Midwest are now. Even if the zombies DO come back, they might not all be focused in the same places, while active people would also have more incentive to spread out hopefully balancing out activity levels between the new regions.