If it requires a pilot's license, it will not be "available" to most people, and will not replace automobiles except for a few wealthy people. It might become a taxi service from airports to hotels, and maybe replace some helicopters for emergency and maybe even military tasks.
But, if it is treated like a large drone is currently treated, with minimal FAA regulation, then there would be more people adopting it if they can afford it.
We have a history of laws and regulations not keeping up with technological innovations. So, we could go the way of unnecessarily restrictive regulation, or the opposite extreme of having these things get damaged and rain down on the infrastructure below before laws catch up to limit the hazard.
Remember, the drone software has advanced tremendously toward making them easy for humans to control. That will be applicable to these devices, too.