Fisherman: The faith of JW does not stand on Bible interpretation but on a perceived and experienced relationship with God.
Their faith in God might not require the 1914 explanation, but their faith in the GB as God's conduit on Earth does. A JW who loses faith in the GB and the organization's teachings does not have to lose faith in God; they are free to find another Christian denomination and test that one. The organization used the revised 1914 explanation (since their actual interpretation proved incorrect) to claim a certain authority and promote their sect. But its usefulness is waning, and may eventually work against their efforts.