Wow -- interesting, but the NOISE of the thing! Geez!
I could see it catching on in Japan, but not here; maybe with techno-hipsters, but that's about all -- for one thing, I'm not sure the motors could handle the extra weight of the average American (and that's not even addressing the obese sub-group). I can also see a LOT of personal injuries due to collisions on the sidewalks when alphas fail to cooperate and share ROW.