How will the Watchtower survive all this and still be directed by a bunch of delusional old and odd geezers is beyound me to comprehend.
It isn't really. Do we seriously think the GB had a role in deciding to sell Brooklyn & move upstate or to change the donation process? Or decide to sell off all non core foreign Bethels? Clearly these decisions are taken by accountants & lawyers - in some cases non-JW consultants. The GB just rubber stamps them. Other than ( maybe ) an occasional doctrinal "new thought" ( and I would guess not very often - these guys aren't exactly bible scholars or the sharpest tool in the box ) , the GB are just figure heads really.
The WTBTS is already at standstill or in decline in most first world countries outside the USA - it competes rather poorly with other evangelical / protestant religions in 3rd world countries but picks up enough converts ( of variable quality ) to acheive marginal ( 2% per annum or so ) growth. There's no reason to assume this can't continue.