Rather than pass this on to the consumers, why not make this a mandatory feature for all vehicles and make this a built in part of the vehicle's safety system.
Sure, the cost will be passed on in the vehicle retail price but the economies of scale will make the cost of an individual dash cam far more cheaper than if the consumers will buy this directly.
Even MB is toying wit, or already has some built in, cam/FLIR system for their vehicles already. Other vehicles have all around cams already to assist in parking.
