[shaki-dora]

Maybe there’s some benefit to encouraging people to concentrate in urban areas. The US specifically is already ruined by urban sprawl. Making long commutes easier may just threaten the last remnant of pristine nature remaining.

Apart from ecological concerns, there are also social trade-offs: flying cars may allow you to get to work. But they do not facilitate the social interaction that comes from strolling down Main Street, having a coffee, and interacting with people you may meet.