Interesting discussion. What I do know now that I work in the medical industry, is that there have been a number of advances and changes in operating and using several procedures without the use of blood, but the JWs have absolutely nothing to do with it.
The purpose of developing such new treatments come as a result of the AIDS crisis in the late 70s and 80s that made the blood banks and the blood acquisition and processing system insufficient. Also, there's a lot of cost added to the use of blood in procedures, many of which have been substituted with more cost-effective and technologically advanced methods.
The JW attitude that they have influenced the medical industry to come up with blood-less treatment is top notch BS.