Dr. Ed Dutton (The Jolly Heretic) on YouTube penned a book called “At Our Wit’s End” where his thesis as that humanity is currently on a genetic downward spiral.
If his point is that too many people with fatal genes are living to reproduce—and the the best genes—especially smart women — are not reproducing at all—I would be inclined to agree.
But weird stuff happens. Life finds away. There is a tremendous amount of cross breeding happening. That doesn’t weaken the species.