I believe the concern now is long term sustainability.
DITTO. Many here speak like the WT leaders are a bunch of buffoons, and from watching JWTV, clearly most of the GB are just that. However, these are not the men who are really running the WTS.
Whether it is from the advice of knowledgeable "insiders" (there are some very successful JWs) or outside consultants, I believe the WTS directors saw the opportunity there was to sell off high valued assets that were extremely high maintenance (ie, Brooklyn 100yo real estate) and build a low-cost, low-maintenance HQ for 10% of the profit and invest the 90% for perpetual income.
Ditto with the sell-off of dozens of Bethel Branch properties. ($$$$$$$) Turning real estate assets that generated huge maintenance costs into CA$H that generates huge investment income.
So too it was with many 1000's of Congs that had $1000s-$100,000s of cash on hand sitting in low-interest bearing (or NO interest bearing) cash accounts. While these were mostly small amounts of wasted capital when considered on an individual basis, amassed together it is MILLION$ that has the potential of generating a huge amount of income if invested wisely as a lump sum. So, you witnessed it as WTS stealthily swept in and "confiscated" the (my estimate) 100s-of-MILLION$ for their own advantage.
As voluntary donations dropped, they brilliantly switched to a "mandatory tithing" system at Cir Assm's (which now cost in the area of $10,000/day) and they concentrate on the use of every Assm Hall every weekend by instituting Spec Meetings and streaming the Annual Meeting, thus allowing R&F JWs to feel "special" and to give more "donations" more frequently to "Mother". This is the same "mandatory tithing" they have used for years for major expenses, ie, CO's cars and insurance, and GL insurance on KHalls (though they really expect the local Cong to carry the expense of any damage repair), and the cost of bringing missionaries home for Int'l Conventions.
COMING SOON AT A KINGDOM HALL NEAR YOU: Expect to see this "mandatory tithing" implemented with an "suggested donation" from every Congregation. I speculate you will soon see an "average donation/publisher" recommended and every Cong will be expected to meet that donation amount (or see a FOR SALE sign at your KHall).
Many non-profit institutions, ie, universities and medical centers, while they charge fees or tuition, do NOT rely on these as the only source of income/profits. Most have huge endowment funds (one I know that exceeds $1 Billion) that are wisely invested to produce perpetual investment income and they still continue to ask for donations from the alumni or members of the community and have telethons or charitable events to amass more funds for their endowment. I believe this is the purpose of the WTS current sell off and cash grab as it will reduce their dependence on mere donations (which are likely on the decline).
JMHO -- no insider information. . . . . Doc