This is always a red herring thrown by JW's. Even if blood 30 years from now is considered "bad medicine", it does not justify decades of abuse of power in enforcing it through shunning.
Someone used the example of Isreal being told to circumcise on a certain day, and lo and behold that just happens to be the day the body produces vitamin K, and can clot blood easier. So we may not understand why something is forbidden, but the reason could be supplied as medical advancement is made.
My response? (Close lower jaw). Number 1, circumcision is not a requirement. It is up to each person to decide at this point. Second, how do you know the Isrealites (who were the only ones seemingly cutting off foreskins), didn't kill a bunch of their children, and figure out if they waited....they didn't bleed to death?
Also, this is either a biblical issue, or a medical one. It can't be both. You are either refusing (wether it is good or bad for your health in any scenario), because you believe God has directed you to or not. No invasive procedure is "ideal". A person today affected by a tainted batch of blood, is a tragedy. But if 10,000 people benefited from that same procedure and it even saved some lives, do you stop because it has that .01% chance of doing harm or having someone reject it? I certianly hope that one day blood is not neccesary anymore to treat patients. Much of this could even be solved by allowing use of your own blood stored for later. I should have saved my childs cord blood for stem cells in the future.
The point is that YOU should be able to make that decision, without the threat of displeasing God, or communal shunning over your head. THEN is becomes a medical decision, and you can make the one that is right for you and your family.
Her response......crickets.