The connections between Scientology, the Jehovah's Witnesses, and the tax laws are especially important and so far, how the tax laws have been and are, responsible for the shunning practiced by both these cults, have yet to be addressed fully.
Until somebody, somewhere, connects the dots between "sincerely held belief" and how that particular tax exempt requirement of qualifying that sincere belief relates to disfellowshipping and shunning, I don't think that an exposure of how these cults operate will be complete.
Regardless, what will dictate whether or not Remini goes ahead with an expose on the JWs will be entirely determined by how much advertising $$$ can be generated beforehand. If advertisers have WTS connections...the show won't air. Celebrities might do the talking but $$$$ does the walking.