I would imagine as the average height increases, from a product design point of view, cars, planes, etc. will become more accommodating for people who would be considered very tall today's standards
This assumes that average height continues increasing, which is not a given. The Dutch might represent the peak. They might not ever get taller. Americans might never reach that height.
I would also not assume that airplanes would become more accommodating to taller people. They certainly have not become more accommodating of fatter people despite a lot of movement in that direction.
Cars have become worse, probably due to safety standards. The lower ceiling height, thicker pillars, and cab-forward massive dash boards with highly sloped windshields. I'm thinking about getting a Mercedes commercial van; that ought to fit, and I can sit upright.
This is the main reason I will only consider full-size pickups for my primary driver going forward. I cannot accept the limited visibility and poor ergonomics of sedans. I'm not exceptionally tall, at only 6'2".
I would also not assume that airplanes would become more accommodating to taller people. They certainly have not become more accommodating of fatter people despite a lot of movement in that direction.