Nice job Cedars, keep it up.
I think a 'tipping point' for the Witnesses, at least in the US, is when the number of ex-Witnesses ( or those who only associate thru family, but do not believe) exceeded the number of Witnesses. The Witnesses often cite the number of Memorial attenders as people who are 'waiting in the wings', interested people from the street. In reality, the vast majority of these Memorial attenders are former Witnesses, or family members who have come because of family considerations. They do not believe and will never believe. At the point when there are so many people who know enough about the religion to know that it is bull****, the religion has very limited growth potential.