Fractions are personal choice they are not the whole life blood but conponents that maybe couldn't be considered life blood anymore, wisely Wts leaves it upto the individual to decide, as for giving blood I don't think the blood orgs would guarantee it would only be used for fractions. Also they would still have to take the blood in its lifeblood form from you they couldn't just take the fractions.
I await the time when a better product than blood is found and this whole debate can be shelved. I wonder how fast would people be demanding an alternative to blood if one existed thats does all that blood does without the consequences? the doctors would be first in line for themselves.