Other Televangelist religions seem to be coping money-wise so I dont see why JW religion would not do so also.
If it morphed into just a TV religion, they could still sell their merchandise and receive donations ,maybe they may not be as big as they are now ,but they could still carry on and reap the benefits of selling all of their property worldwide ,that would be in the billions of $$$$$
When the "Writing Is On The Wall" you need to take heed of it and make the best of it.