SBF: How this plays out may depend on the complexities of the legal structure of JWs, including obscure aspects of the legal foundation that only become apparent under stress.
Popular legend has it that on October 31, 1517 Martin Luther defiantly nailed a copy of his 95 Theses to the door of the Wittenberg Castle church. The Catholic Church is still around 500 years later, albeit a much different kind of religion that it was during the Dark Ages.
Things are much different now in the modern Information Age. But as much as I'd like to see the cult known as Jehovah's Witnesses go "bye-bye" I don't see it happening entirely. Too many humans that love to be told what to do are currently followers. It may become more of a fringe religion than it already is, but I don't see it entirely disappearing in the short-term.