The org makes money out of congregations selling their current hall and building a new one because of the free labour. I can't see them wanting to reduce the number of congregations doing this. It wouldn't be surprising to see a huge reduction in renovations and refurbishements as these prove to be costly to the society with little return.
They will be only too happy to build halls in third world countries for a variety of reasons. Building solid buildings will make them look rich and attract new members who will enjoy the comfort of these halls It provides the JWs with a shelter in times of disasters, unfortunately the society uses these situations to boast. A lot of our third world countries are actually improving in wealth, land is becoming more expensive and likely to only go up in price.
At least with this new arrangement the brother are going to feel poorer and with nothing to show for it and no goals to work towards, such as a nice new hall.