This is disgusting. When they want to "simplify" something it's always because of either legal or financial reasons. They probably don't want to explain the accepting your own blood and fractions doctrine to the older ones who would question the change.
I can assure you, as a nurse who has worked in A & E ( ER as you call it) the default option is to save life first, if there is any question. Do please have a word with your doctor and get him to make a note on your medical records that you are being, essentially, bullied into signing. How about wearing a medic alert bracelet or chain with a note INSIDE stating you accept blood if it would ease your mind?