Beautiful, poignant, and true, Yael. Thank you.
The most hopeful view that I know of our likely post mortem anonymity--whether we have children or not--is the end of George Eliot's Middlemarch, which you probably already know: "for the growing good of the world is partly dependent on unhistoric acts; and that things are not so ill with you and me as they might have been, is half owing to the number who lived faithfully a hidden life, and rest in unvisited tombs." For some reason that has given me some resolution to the fear of being forgotten, and a reason to care about those I'll leave behind.
Take care.