Actually IMHO from reading CoC(not finished yet) they probably have been realized the error of starting this doctrine but as Ray Franz noted for the sake of the numerous people that have died already because of this policy they don't see the need of stopping this practice for it will make it seem as all the ones that have died already, died for no reason. But yet you will let others continue to die to save face. How come when the borg was first started they were getting transfusions and the like but then said ok let's stop doing that. Then so many were dying (loss of income for WTS) they said ok, let them use other solutions to take the place of blood....Now they allow the use of parts of blood but call me stupid sue if its a part of blood, doesn't it come from BLOOD. Excuse my example for any that may be offended but that's like telling a muslim you can eat a pulled pork sandwich because it's such a small portion of pork, Ummmm it's still pork. My bad I forgot most JW's still deep in the borg don't think in that way. I think I read somewhere else too that a blood substitute that's now allowed comes from cow's blood. Maybe they're thinking because it from a cow its lesser than human blood.
blood = blood = blood parts = blood = cow's blood = blood = blood
Sooner are later they are gonna have no other choice but to admit they were wrong and start allowing blood transfusions, but maybe they're hoping those 8000 still partaking at the memorial will be gone to the "upper room" by then so they won't have to change the policy. Or they keep changing it little by little and then when they finally can't change it anymore, they will say Jehovah has given them new light on the matter and he didn't mean they couldn't have a transfusion he just meant don't eat it or drink it. Only time will tell.