This common claim that "we need to die to make room for other people" is not obviously true, good discussion here: https://www.lesswrong.com/posts/ufjFuHmJoysXrKXYQ/what-exact...
Also, don't be so quick to accept death as a good thing: https://www.lesswrong.com/posts/Aud7CL7uhz55KL8jG/transhuman.... It's basically the worst thing that can happen.