Apologies for getting off-topic but: what gets me about the Segway is that a lot of what Dean Kaman and his boosters envisioned has come true, at least in terms of the availability of small personal transportation. It’s just that the secret ingredient wasn’t the Segway, it was smartphone apps, cheap batteries, and the “abuse the legal interstices” model of startup disruption. Unfortunately this last one also means that urban planners end up aggressively hostile to building systems of support around scooter sharing, and not without good reason.
(EDIT of EDIT: Thanks to @FGD135 for moving this to a better spot!)