The Watchtower Society will continue to adapt and evolve to make sure of its own survival.
Eventually the dramatic expectation regarding thefullfillment of the "end times" will be traded for a much more conservative model. It may not happen today or tomarrow, but give it fifty years or so. Eventually the hopes of the group will be faced with disconformation, the realization that what they assumed about the "end of all things" wasn't correct. They will then find ways to move their group beyond such hopes. They will survive.
I do believe that 30-50 years from now the reilgion will look much differant from what it is today only because if it doesn't then it will not survivie. Whle the WTS proclaims that they see the world in black and white, they have shown that by their actions that they are planning in the grey.