Not allowing yourself to be emotionally abused is not the same as cutting your parents off. You're can cut them off in the sense that they are presently incapable of having a healthy, mature relationship with their child. The blame is all theirs. Ending a toxic relationship is sometimes necessary.
You can still have a measure of hope, while you take steps to prevent any further emotional abuse.
Unless you are taking positive steps to have meaninful interactions with them, using Hassan's techniques (or some other method), you can expect them to go to their graves being JWs. The natural course of events is for them to retain their JW beliefs and worldview.