From a medical position JWS feel blood treatment is too risky and more of a risk than non blood even in the face of death.
I strongly disagree with that sentiment.
The moment Watchtower doctrine removes a prohibition against some blood product JWs who need that blood product line up to get it. Take for example the blood product known as cryo-poor plasma (also known as cryosupernatant and cryoprecipitate-reduced plasma). When JWs learn they can accept this product rendered from blood they line up willing to accept it to the tune of 96 percent. (See: Over 96% Accept 99%! )
As for risk, Watchtower makes JWs think they're protected from blood borne pathogens, but it's a horrible lie. (See: Death from TRALI? )