A review of the history of the Watchtower Society shows that there have been major defections from the organization at various times. With any change of doctrine, some leave the organization. With major changes, many leave. Many of us have felt that the next large issue would be about the 1914 date. That has been very important in all the Society's reckoning. That would constitute a major change.
On the other hand, the Society has skillfully introduced small changes leading to a major one to prepare the members. Perhaps, the "generation" change tested the waters for this. It all remains to be seen. But I do believe changes are coming. They have in the past. And they will in the future.