Watchtower has married itself to a handful of things that it will find hard to separate from, let alone divorce itself from them.
Number one is 1914. They had chances in the past and decided not to take them. Now they would have a battle on their hands if they ditch it. They kept reinventing their past to say that they have always said accurate truths about 1914, so they got more and more intertwined with it.
Number two is the great tribulation occurring before "this generation" has passed. Blast that Bible anyway, it makes it too hard on that one. So they have changed what "this generation" means many times. Their last couple of changes have kept them firmly married to Number 3- the anointed. The overlap generation has bought them so much time, but it's at a point of ridiculousness. They will eventually have to change again, if Watchtower isn't gone in 40 or 50 years. Maybe they will leave the generation in place and change the meaning of what is supposed to happen before they all have passed.
Number three is the anointed. When the number of JW's was getting too big, they pulled that one out of their Bibles. They kept it around too long. In the 1970's it totally became the basis of their power structure and it has been highlighted as such ever since. They messed up way back when by allowing the anointed to be a bunch of followers. They should have corrected that long ago. Because the calendar is still driving their need for doctrinal changes, they will further attack what "anointed" means and who is it. I see a future where they declare that Holy Spirit (and Freddy Franz) have directly told them the number is full and only a very few men needed to be their spirit medium Governing Body members are actually of that group.
Think of all the money on wine and crackers that will save for congregations. They can buy the tiniest bottles and not worry about partakers.