If you are a dub you believe in a god that can accomplish anything with magic. He can destroy every human being on earth but some JWs during big A. A god that sends fire and brimstone with directed tornados while protecting his people could very easily make the roads stay clear, or clear them in a blink if an eye. He could without any effort protect warehouses of equipment and supplies and tell his people where they are. When you are omnipotent and magical NOTHING matters. There is nothing that his HS or magic couldn't fix or do. So there likewise, there is no REAL reason related to any impending doom to move. For a true believer you could stand in the middle of a street and god would make the buildings fall around you and not on you.
The move shows not that the GB is worried about Armageddon, but rather that they are worried of other things. Impending doom makes no logical sense to a dub. God can do anything. The move proves something else is going on and that GB doesn't have their money where their mouth is. End is not close in their minds either. At least not in the next 3 yrs.