I think a lot of it has to do with the closing/sale of Kingdom Halls [..]
I don't see going back to private homes, at least in the US, due to liability/zoning/parking/ADA issues.
I certainly think the Org has little wriggle room on most activities - including the more extreme ones I listed, which I was just brainstorming - in most parts of the world, especially the more "advanced" places like North America, UK, Europe and Australasia. And they're aware of this, which is why they've kept the detail of what they really intend to do (should the GT actually happen) very quiet.
As the world is now, the most they can do globally is radically rearrange circuits and zones, selling off facilities and herding the R&F into different sized congregations/groups or locations as they see fit. They already started doing a lot of that. As part of it, they can also radically rearrange their own internal organisation, perhaps replacing COs with rotating localised elder appointments, adjusting the average size of congregations, changing meeting times, teaching and structure, and so on.
They might try tightening up financial demands, but unlike some other groups like Scientology and the Mormons, they're limited in what they can do there because they don't have enough control to demand specific payments from their followers, nor does their historic teaching encourage members to earn enough to be high-paying donors.
But currently, their only levers with the R&F are organisational and financial.
None of this means anything to the outside world, but big changes in these areas would cause huge ripples of discontent internally.