Maybe Watchtower leadership is smarter than we think.
One of the major reasons the WT has avoided much public scrutiny is because they've carefully disconnected themselves in as much as possible with links to famous members.
The reverse is true with Scientology. They actively court celebrities. The WT has tried as much as possible to distance itself from Michael Jackson and the like.
On the one hand you have high-profile exposes of Scientology and a first-rate movie about their founding (The Master). On the other hand, JWs barely register on the public-consciousness scale even though there are far more witnesses than scientologists in the world.
There simply isn't a big enough market for a Ray Franz biopic. Outside of the current and former JW world, people barely even know JWs exist.
I may be wrong, but I believe the guy who runs JW Facts has said the area of his site with the most hits is the section regarding famous JWs.