edit: women live longer than men so perhaps there will be a greater role for women?anyways I think it is a good idea to keep an eye on what is happening in the world outside to see if JWs may mirror such shifts
As far as I can see women already outnumber men in many congregations. The men are more visible due to their penises granting them the ability to speak on the platform and run the organisation but I would guess that most congregations I know have a surplus of women to men.
As for roles, the GB would rather gnaw their own fingers off than give women an equal role in teaching and judicial authority. The women already do a grand job of standing by carts and providing free manual labour on building projects thank you very much.
As for those places where the penises are already in very, very, very short supply then there is always the tea towel to save the day.