The organizations that the WTS attributes itself to have undergone major splits in the past. The WTS is not the religion of Russell, The Bible Students. The Bible Students actually continue to exist to this day. When you think about it, technically the Jehover's Witnesses are a sect of The Bible Students.
If there is a fracture in the WTS, a few new religions will emerge and the ones loyal of each organization will declare that their religion is the one and only true religion.
There will never come a time when the organization will fracture to the point that nothing is left and leaving only the individual people to wake up and wonder off to their own destiny.