Because we fail to use surface infrastructure and transport more efficiently, we are supposed to squeeze ourselves into cramped cabins that airlift us to our destination. No matter how many vertiports (a large number will never be likely), there will always be a door-to-door element to aerial transit that needs implementing by ground transportation, a surface vehicle. Unless of course you have your own vertiport at home and one on your office rooftop. https://medium.com/predict/flying-cars-is-the-sky-the-limit-cf73881158b9