@St George: Upkeep is a really expensive part of owning a building. Less upkeep such as heating/cooling/water/maintenance is more money that gets sent to the branch, less buildings, means more density, even if you lose a little bit of donations per congregation, doubling or tripling the number of congregations per building means a bigger revenue per building.
Then there is also the psychological effect of having a lot more traffic at a building vs having a few cars pull in and out at night makes the building look a lot more popular than it actually is. Becoming a mega-church every weekend will make some people ooh and aah.
I think they know they’re at rope’s end with expansion, now it’s just a matter of improving efficiency of what they have so they can stretch it as long as possible.