Cue moral outrage in T minus 5
It's a good advancement but my concern would be the residual plastic left in the blood stream after an artifical cell breaks down. Until the process can use fully organic and swiftly biodegradable plastics, I wouldn't feel happy about it being used in a transfusion.
However, if we're going to start speculating, this plastic blood could be used in things like replacement limbs, if you had some sort of membrane that could transfer oxygen from blood cells in the central body to the limb.
Another use could be the development of organic computers as a potential power source of some description, although the complexities of it would be way beyond my understanding.
"Science - it WORKS, bitches!" - XKCD