I wonder how many JW's will be sensible and take blood if it proves to be either a cure, or a protection, which is being worked on by researchers as a possibility ?
I think "Judicial Action" against any taking blood has been light in recent years, and in the circumstances above the JW would be totally excused.
The whole JW teaching on Blood is a total mess, and totally nonsensical and cannot be backed by Scripture unless such words are really twisted and taken completely out of context. Any DFing etc. will expose their murderous, baseless, teaching to more Public scrutiny, and bad Publicity.