Creating synthetic organs?
I am sure there are lots of people who will be against it and might stop it from happening.
Why?
If we have researchers doing such a kind thing to humanity those who benefited from illegal organ trafficking and black market sales will be forced to close up and find other things to do. So, they will try to stop synthetic organs from happening.
But it would be really nice to see all those sci-fi events becoming a reality in the field of medicine. It might possibly reduce the queue for getting organs for our loved ones.