Is There a Pyramid Scheme of Meaning in the Future?

Many of our meaning creating activities are conditional on their being continued or developed in the future. So, you know, I'm in effect, counting on future people for the meaning of my life. The future people need to be involved in projects like mine and on the assumption that they are, then the things I'm doing retain their value. But it's a kind of just brute fact that you can only get meaning from doing something if there are future people who are going to sometimes continue that broader project.