Ethically it’s more immoral to raise an animal to eat since we don’t strictly need meat to survive, than it is to raise them for organs that will save our lives. So I don’t see a problem that way either. Unless we make laws mandating vegetarianism for ethical reasons I don’t see why we wouldn’t permit this.

And, honestly, we can already grow heart tissue in petri dishes from stem cells that will start to beat when enough muscle cells become present. Do we really want to grow these organs in pigs instead? We have zero clue as to what transgenically cloned organs will do to the recipient.

It may pan out, but I doubt that we’ll have this available within ten years. I doubt the FDA human-approved trials could start within that time frame.

Normally I’m a cheerleader for this kinda thing – but we can keep a lung alive in a jar for 12 hours, and fake a pig heart being alive for surgery purposes – within ten years we’re more likely to have in-vitro organ cloning than in-porcine organ cloning, at least from a safety standpoint. At least, with that method you only have to worry about random cancer from the viral vectors used to induce pluripotentcy in human stem cells, and not the viral vectors + whatever happened to be living inside your host pork at the time of organ cloning.

And, honestly, the way animals and treated by science and industry, on a moral stance alone I’d rather have in-vitro than in-porcine organ cloning. Less chances for abuse. Factory farming is bad enough, can you imagine factory organ farming?