Attempting to apply logic to WTS doctrine and making a prediction is an act of futility! If they make any significant changes (which I sort of doubt), it will be the kind of stupid "generation" change that leaves everyone scratching their heads.
Actually, the current changes including what I perceive is the Rapture by a different name, is pretty big yet no one in the study I attended seemed to get it. I actually didn't notice it when I first skimmed through the article. It was only when the paragraph was read that it struck me that they introduced the rapture doctrine. Remember, according to the WTS there are "true Christians" which means annointed and their companions which means non-annointed JWs. So, they could still say that all "Christians" left on earth get raptured before things go sideways and still keep their two-tiered system which I don't believe would ever go away.
Ah, 99% of JWs could care less about their doctrine. Listen, obey and be blessed is all they need to know.