StarTrek taught us that you can transfer Kirk and Spock to a different place by re-assembling their atoms in a different place. But is it really the same Spock that pops up there? Or a copy? A copy obviously. Such a copy cam then live on practically forever because they could always re-assemble a younger Spock. But since it is aa copy would Spock really be happy that his copy lives on forever? Yes I believe if he thinks about it rationally. And Spock does.