We are in no danger of going extinct as a species.
Even biblically, if you incline that way, we lose half. Thats still like 4-5 billion people left.
If every person was reponsible for themselves, you’d be correct. Our numbers would be irrelevant, but we’ve created a society that is dependent upon having children to fund the retirements of old age and we don’t have the children to do that.
Our children have failed us.