the wt leaders already know their current stance on blood is unscriptural
their motivation is money and power and corrupting others
they get more power from satan by getting dumb jw's to take blood via fractions while thinking they're really abstaining from blood
that's why they won't change the doctrine - it's already corrupted and they like it that way
to them it's like illicit sex, they get a kick out of it
thing is, they're busted and now they have to pay the piper