Why wouldn't anyone want to be immortal? Living through centuries, experiencing different times. I don't think there is any ethical issue with immortality but there is concern about the sustainability of nature and its resources. What if we don't find a way to sustainable resource production but manage to attain immortality?
What I do bilieve is that it may be possible to prolong a person's life for some centuries but putting in life back into dead bodies, I dont think that's going to happen. It will also lead to many complications . Death certificates and death sentences will be a thing of the past along with other things