Someday the Earth or the Solar System will see us off. It may happen next month or in a hundred thousand years. But it will have absolutely nothing to do with over population. I’ve visited and flown over quite a lot of this planet’s continents and it’s mostly empty land. Ninety percent of the areas occupied by humans are horrifically mismanaged and under utilized. We could probably multiply Earth’s human population several fold and still have room and enough food (efficiently distributed) to grow.
Of course, the people are concentrated in smaller areas. Perhaps your observation only adds to the concern for overpopulation by emphasizing the uninhabitable and nonarable areas of the earth.
But considering the total land area of earth of 510.1 million km². With 7 billion people, that leaves 1 person standing on a square 270 meters on a side over the entire land mass of the earth. So it has to be that we are approaching some kind of limit in short order.
( I checked this several times, but I’ll accept corrections. )