Yeah the naivety and/or selfishness of folks wishing to be immortal is beyond me, something about primary school math lessons skipped. I do hope they are not parents (at least yet). I can accept it in some form once we reach other stars, but not in this century and definitely not in next one neither.
First of all, such technology would be usurped by dictators for dictators only. Stalin, Mao, Hitler, Putin and endless stream of other pathetic figures, they all desperately clinged to life and would burn this world to the ashes 1000x over just to stay immortal. I can't imagine how we could avoid global semi-permanent slavery, not with actual real human nature that we see manifested in the news every day. Its fine if you wouldn't use it malevolently, that says nothing about more capable and more sinister individuals who are out there in numbers you probably would have hard time accepting.
Second, where do we put all those folks if we actually achieve some hippie paradise? How do we feed them? Concept of individual ownership goes very much against this. The opposite is communism, which has 100% failure rate, and we tested it already on few hundred millions, no thank you. You have to live through it to see and feel its failures in their many aspects to understand, I did and never ever want that back in any form.