Lets define congregations Pork. Congregations I take to mean groups of PEOPLE.
There are not so many new buildings being built to accomodate large numbers of people, but rather a consolidation of fewer people into larger, single buildings.
Consolidation means putting together diversified (logistically speaking) people in a more central location. I think I understand where you are coming from just fine. New kingdom halls are not being spread out into the burbs and rural areas, they are being concentrated .