Did you not pay attention in high school? When you step on the gas your car, you are converting electrical energy into kinetic energy. When you release your foot, the kinetic energy that is stored into the car moves tires, which moves the shaft of the electric motor. What happens if you manually rotate a conductor inside a magnetic field? Obviously induction happens, which converts the kinetic energy back into electricity and heat.

>more things that can go wrong. Eddy Current Brakes are a passive system with an extremely high safety track record. If you ignore the bearing that holds the wheel/motor in place there are no moving mechanical parts. I couldn't think of a safer way to stop moving objects.