Since the basis for the treatment is ordinary sharing of blood between an older ill, and younger healthy patient, we can probably expect someone to start offering the transfusion treatment somewhere in the world, soon, to those with the means to find a young and healthy volunteer.
Volunteer? People give blood because they want to help someone who they usually envision as having a horrible illeness not because they want some rich, old guy to live longer than the norm.
I think there will more likely be a blood trade where the young (or criminal organ harvesters) sell blood to the old. Either that or some sort of blood Ponzi scheme similar to Social Security where you pay blood in when you are young that is immediately used by the old and recieve blood from the young when you are old. Of course, everything breaks down when the previous generation becomes smaller than they current one. Although, I would not be surprised if by that time there would be synthetic blood that would serve the same purpose.