If this becomes commonplace and animals are bred/raised just for their organs, we get into murky ethical territory. (Yes, people already eat the organs for food, that's murky too. But industrial scale organ farming sounds even worse somehow.)
Xenotransplantation is one of the life lines I'm counting on. I'm hoping that, by the time I need it, the issues that we currently have will be worked out. I have zero ethical issues with breeding and eventually culling pigs in order to save human lives. I hope that there will be other, better, breakthroughs by then, but if not, the best I can hope for is that the pigs are raised in a sterile and enriching environment, and that the only bad day they have is their last day.
I also like chicken liver. It's small enough to be cooked whole.
I'd like to try pig liver.
While I don’t think we should be torturing animals or anything, obviously, I think I am humanist enough to where I think the ethical thing is to prioritize human lives or avoiding severe long-term discomfort (as is the case with dialysis).