I googled if it was possible. It harder mid flight, but take offs or landing its much easier. I would rather we accept the fact this risk exists and take the necessary precaution of putting someone at the door that can more handle the situation than pretend it doesn't exist.
To me it seems the biggest dangers about exit doors are not accidents. But someone who snaps and wants to open the exit door during take off/landing where the outside air pressure is low enough to more easily open the door. In this kind of situation a strong man doesn't hurt.
The HUB takes up all of the space where you disk or drum brakes would be.
ICE cars don't benefit from regenerative braking so you'd have to come up with another solution of how to stop the car.
We had the same problem with power plants dumping hot untreated water back in the environment. This is why cooling towers are synonymous with nuclear power plants. This is an easy solution to fix, but like all engineering it costs extra. For power plants it was fixed through legislation. You literally have an entire oceans worth of water to reconstitute the brine. This was more problematic of older system using distillation.