JWs are scattered across the globe. A few million people left, pretty isolated from each other.
Telephone lines and power goes down since the people who supported the infrastructure are dead. Communication across town, state, country, etc is cut off. Oil refineries shut down, gas for travel starts becoming unavailable. Crops dying in the fields, livestock used for milk and meat start their process of dying.
Manufacturing of replacement parts for automobiles gone.
Basically everything on the TV show, Life After People comes to pass.
The JWs who survive are mostly ignorant because they preached for decades that college should be avoided.
The JW post Armageddon world will be a society thrown back into the stone age. Far different from what they depict of happy smiling well clothed and fed large groups of people together. Ignoring that families would be cut off from distant loved ones not knowing if they survived. Cut off from the governing body to get their spiritual food and direction.
Sounds like hell on earth to me.