We get to "shape" our culture.
If we fail to reproduce, we will be replaced by a civilization with a higher birthrate.
Muslims may end up replacing us.
No doubt and a big problem is that our culture values things too much. . We encourage the young to pursue jobs not family. The average women’s fertility starts to decline at age 25. Most people get married after that age. It’s a recipe for extinction. We will get replaced by people who don’t do that (like Muslims).