Each lineage is just bragging rights and ego. The species as a whole doesn't care a lot about lineages. A very long time ago, there was a population bottleneck

Each lineage is just bragging rights and ego. The species as a whole doesn't care a lot about lineages. A very long time ago, there was a population bottleneck that reduced Homo Sapiens to a few families. [https://www.science.org/doi/10.1126/science.abq7487 https://www.science.org/doi/10.1126/science.abq7487] Those few lineages are thriving. The species could go on reducing the population for a long time. Who's to say we wouldn't be vastly better off with 500Mm overall humans? The population could shrink down, then expand again. Shrinking now is not a bad thing, it's just a change from what we had been doing.