There's something very dystopian about having healthy people give away organs, just to increase their loved ones' chances of getting a transplant.
I have heard of donor chains, where patient a's relative donates to patient b, and so on - so every family involved both gives and receives a kidney. I would donate under those circs if a loved one needed me to. But if I'm giving a kidney, my kid has to be definitely getting one, not just getting an improved probability of one.
