It's already happening.
Let's be real, Watchtower does change its teachings and policies. We can clearly see efforts on their part to appear more moderate and less extremist to the public. This shows they are aware of their extremism. We have seen reform in the blood issue where they now permit members to have what they call secondary fractions of blood components.
I think that reform will take place/is taking place very gradually without them making any public noise that they are reforming. They can't be seen as acknowledging that they have been very extremist in the past, so they will reform very slowly under the guise of "Jehovah's chariot moving ahead" and getting a clearer understanding of the scriptures as time goes on, and while avoiding use of the term "reform".
They have no choice but to reform in order to remain relevant in this increasingly more enlightened world where bigotry, hate-speech and other disgusting practices are becoming less and less tolerable by society. And they know that they can always spin the scriptures to justify taking a more lenient position on matters they were hardliners about in the past, and all - most - JWs will just blindly go along in the name of loyalty to "the channel that Jehovah is using at this time".
Once it becomes apparent to Watchtower that a hard-line position is more detrimental to their recruitment efforts and is giving them very bad publicity - once it becomes apparent to them that a hard-line position is more of a liability to them than an asset, they will reform that position. We can help in that process by continuing to vocally sensitize and educate the public about their very damaging hard-line policies and practices that destroy families and even result in loss of life.