I honestly don't think there's some end game escape scenario master plan. The GB know they're liers but also sincerely believe it at the same time. They're on a mad course and will try their darnedest no matter how far they go, never admitting defeat and hanging on to whatever believers they can. The religion will probably never go away, just change.
I used to think that for sure. And you are probably still right to some degree. I feel that at some near future point, they will realize they need an exit strategy.
But we don't know.