Interesting thread! It would take an awful lot for me to go back:
1) After being in the Borg, I have a strong aversion to participating in organized religion. Therefore, they would need to disassemble themselves entirely.
2) The JWs would have to be totally respectful of each individual's varying interpretations of the mysteries of the universe, including any varying religious or philosophical beliefs, as long as they are not harmful to others. (This, of course, would require them to change their name from JWs to something neutral.)
3) The JWs would have to eliminate all their rules.
4) The JWs would have to issue personal apologies to me and all who were mistreated. Then, they would have to publicly apologize to everyone, admit they have been wrong about everything, settle all valid lawsuits against them, sell all their assets, and use the proceeds to create resources to help those who were wronged to heal.