It depends on what you consider overpopulated to mean. Abraham Lincoln’s father was supposed to have said that when you can see the smoke from your neighbor’s chimney it’s time to move. Years ago I read something about the world’s most densely populated city. I think it was Singapore, anyway I did the math and determined that if you had that many people standing on a flat area of the size given for the city they could stand in ranks like an army and each person could put his left hand on the shoulder of the person to his left and his right hand on the right shoulder of the person in front of him. Obviously there must be a lot of high rise buildings that people live in. I don’t know your opinion of that but to me it meets the definition of Hell on Earth. I grew up on a little forty acre farm that my father called his “Doodle” farm because it was so tiny compared to what he grew up on. I don’t follow the Georgia guide stone idea of reducing world population to 500 million or less but I would be quite happy to see the increase come to a halt. Some of us just prefer some open space. I currently live on eight beautiful acres on a river bank and it seems tiny to me.
I spent two weeks in Singapore a while back. During that time I rode my bicycle around a large part of the island-city. Wonderful place!
I visited high-rise housing communities with small factories on the lower floors and open space around them. The 'downtown' areas had boulevards with wide sidewalks and spacious 'sidewalk' restaurants. One day I rode out to a park and spent time tromping through a jungle without seeing another soul.
I, too, like 'elbow room', but there are plenty of places left with lots of elbow room. I was surprised when I made a business trip to India and flew from Mumbai to Pune to Bangalore to Hyderabad to Rajkot to New Delhi. I saw lots of empty land below. Driving from New Delhi to Agra I saw mostly open land.