They can keep it going a long, long time IMO. The buy-in is astonishing to this new building program. The sheep just line up to do whatever they are told. They think they are doing "God's Work".
Even the ones that can see the profit angle just write it off as "supporting the work". No thought is given to the fact that an organization truly backed by God would not have to engage in such money making endeavors. They should be flush with cash from miraculous sources.
Oh well.... this is the result of indoctrinating people week-in-and-week-out. They will continue to indoctrinate and they will continue to control the minds of this small religious group.
Growth is another thing all together, though. I think growth is already pitiful and the trend will continue south, but they can survive on flat growth or small decreases for decades.
-TE