Actually, as they sell off property and have to cash flow through interest on investments, or dividends, or cash donations, they are heading to a crisis, but more slowly.
Imagine if your house were paid for, sold for $300,000
If you used to pay off debt and monthly expenses, eventually you be in the hole again if you had no other source of income, wages, income from rental property, a contracted amount of donations, etc.
The WTS is not going to survive without cash flow, in their case hopefully from donations, more from not such rich members but who are consistent in donating.