Death in nature originally served as a way to remove individuals from a population who are not able to successfully reproduce or contribute to the survival of their species. It would be nice if humans jumped over this evolutionary legacy, and offloaded evolution to organization level, instead of human level. Some would say it would be a way to accumulate wealth for these who use such therapies, buy we have the same issue with people inheriting and multiplying wealth of their parents. No death would change a little in the matter of wealth accumulation: no death = no inheritance. Overpopulation at worst can be controlled by law, but honestly when time comes we figure out how to not die, we'll hopefully also be in need of populating other planets. e.g. we could incentivize inter-planetary migrations to colonies on Europa (Moon of Jupiter) or Mars. Actually Earth-bored 200-old hyper-rich will be probably willing to go just for fun, while young low class will go for money, adventure, quick colonization. With possibility to go back of course ;) Also from what I know prolonging life is the best we can count on, as death is due to accumulation of "mistakes" our bodies make, so fixing them all will take like 1000 years even for AI. In conclusion I would not count on living forever, but I can easily imagine currently living humans to live extremely long, like 300 years.