When Rutherford assumed the presidency of the Watchtower Society he instituted series of sweeping changes to the teachings and practices of the Bible Students. Some of these changes were at complete odds with what had been taught previously. A key example was the elevation of the Watchtower Society as "God's Visible Organization on Earth". The end result was that an estimated three-fourths of the religion seperated over those decades. However, what remained was a core group fiercely loyal to the Watchtower Society that were rebranded as Jehovah's Witnesses. Far from die out, Rutherford's JW's flourished.
Expect the new FDS to get more and more bold with crazy teachings (overlapping generations) and abusive practices (psuedo-tithe). Now that the Watchtower is the defacto owner of every Kingdom Hall they are in a very good situation where they can't lose.
Let's go with an outrageous example and speculate that next year the FDS begins teaching the trinity doctrine and starts passing a collection plate. In response 3/4's of JW's leave the religion. Only the hardcore believers remain and there are more Kingdom Halls that can reasonably be used after the mass-culling of the flock. The Watchtower excelerates the consolidation of Kingdom Halls, selling the ones in markets with a high return.
Like Rutheford before, the new FDS wants complete and total loyalty as the religion moves from cult-like to full-blown cult. The selling of Kingdom Halls will provide income during the transition. During this time anything can happen.
"At that time, the life-saving direction that we receive from Jehovah’s organization may not appear practical from a human standpoint. All of us must be ready to obey any instructions we may receive, whether these appear sound from a strategic or human standpoint or not."