I don't like this idea.
1. What will happen when you lie down on the tank? You will see the sky...
2. What about a passenger? You will see his or her helmet...Finally, you will find out what these guys are doing behind your back during riding)))) You will see their eyes full of fear)))
3. They mentioned mirror vibration. This stuff will vibrate too...
4. What about a helmet weight? Definetely, it will be heavier...
I can't find any advantage in this solution. From my point of view, correctly adjusted side mirrors make this invention useless. It seems to me that some try to turn a motorcycle into a car, but this never gonna happen. They try to bring "car ideas" to riding. Some of them are useful, like abs for instance, but some are useless like automatic gear or this rear mirror in a helmet.