We are talking about a dinosaur changing. While magazines are ending their print versions and newspapers are dying, Watchtower is simply cutting back on print. They will eventually have to stop that, but the average JW mindset is that these printed materials are so important.
I feel it is the same with Kingdom Halls. The JW mindset is that these local small places of mind control are so critical to the flock. Maybe some time in the future, they will have to make the kind of choices Besty speculates, but right now they are nowhere near deciding to close Kingdom Halls. If you asked members to drive to some Assembly Hall every weekend, they would not do it. If you asked them to go there one day a month, they could be trained to do that. But overcoming their current mindset will take some time. I am confident they haven't seriously considered more than closing the occasional hall to cram eight congregations into a double Kingdom Hall and closing the occasional rural Hall to make them drive to the next one.
They will possibly speed up the changing mindset. The book stands, carts are radically different. But those are part of their needed changes that have been forced on them- door-to-door being unsafe and uneffective. Plus, they really don't want to give away many books because donations are down for the printed materials. The book carts are really mainly for their faithful pioneers to still feel like they are being effective.
Your thoughts are good calls. I can see them delaying making these decisions but the need to close Kingdom Halls becoming inevitable. I can see them telling members to go to jw.org for their weekly sessions. But the mega-assemblies will be crucial then. JW's are not likely to continue making donations via the computer. You need to get them to that assembly to drop money in the box.
I don't see them abandoning shunning. It seems so critical to them to force people not to stray away from their rules.
I don't see them abandoning their rules against homosexuality, or even fornication. It goes with the shunning- rules to keep them in the cult.
They wish they could get rid of the blood doctrine. "Fractions" was a way to end their ridiculous extreme rules and still avoid being sued by those that lost loved ones. I can see them making the whole thing a "conscience matter" in a matter of 20 years (or less).