It's an interesting thought, but society would change a lot. Any person trying to live longer today via good health would have all that energy directed towards not being killed for example. Over population would be a concern, one/two child policies worldwide punishable by incineration, dictators and tyrants would live forever. Not trying to be a downer at all, but there's always a cost of some kind. To be honest though, I would expect advances into immortality to be so expensive only a select few could ever afford it, and I doubt they would want it becoming any more affordable. I think I took a rather grim approach to that, sorry, my thoughts anyway hah.