Its an interesting question cognac.... If this were a normal company/corporation the answer would be "when it makes financial sense to do so"
the variable here is that they arnt just a corporation, they are a religious cult corporation. The extra 'god is on our side' aspect may drive them to do some otherwise foolish things... My answer though is ultimately: when it makes financial sense to do so. They will spin it the rank and file as a sign of the end type thing, play it up as "we gave it all up for the sake of the good news" blah blah blah.....
the really interesting thing is that it could happen! They were so stable fo so long its facinating to see it as a possibility