Get enough people to organize and write their representatives and anything is possible! Gays, Feminists, Catholics, JWs with doubts, exJWs, ex-Moonies, ex-Scientologists, and Scientologist with doubts all have legitimate issues with a small percentage of non-profit organizations. Limiting tax exemptions could be a very influential way to encourage change in those non-profit organizations whose leaders care more about protecting the image of their organization than protecting its members and their member's children. The IRS already disqualifies non-profit organizations with links to terrorizm from receiving tax exemptions.
Unfortunately, to paraphrase an exJW, "Organizing exJWs is like herding cats."
Peace be with you and everyong, who you love,
Robert