It's hard to predict what is in store in the future for the organization. If history is a good example, only a few groups have formed that were made up of former Watchtower members. Most individuals become wary of any organized efforts after having experienced the regimentation of the Watchtower Society. Once the ties are broken, it is difficult to form new ones even if some of the new leaders are well respected.
The Worldwide Church of God is a recent example of what happens to an organization when it is split by the leadership. It has fragmented into various groups even though Armstrong's successor controls the organization and assets. Strangely, this leader has thrown out most of Armstrong's teachings and gone back to a more orthodox viewpoint.
I have no doubt that there will be changes in the organization. We have some evidence of that already. But what will actually happen in the future is anyone's guess.