Like I said, the Segway is a decent product for a niche market. I can see them being useful in large factories, on military bases and campuses, for police foot patrols, and for mail carriers.
But as general transportation? Never. First of all, they will NOT be allowed on sidewalks for long unless their speed is limited to walking speed. Kamen has tried to claim that being his by a Segway is like being hit by a pedestrian - yeah, it’s like being hit by a pedestrian going a full run with a 65 lb steel bar held out in front of him, and with a steel plate at ankle-breaking height.
If you put these things on sidewalks in large amounts, and let them go significantly faster than walking speed, there will be carnage. Then they’ll be banned, or governor-limited to walking speed, in which case they will be useless other than for handicapped people.
Then there’s the liability. People will fall off of these things. And if they are used as general transportation some of those falls will be off of narrow paths, stairwells, and other places. I’m just waiting for the first person to drag one up a flight of stairs, get on it at the top, accidentally lean back, and go backwards right down the stairs again with their Segway on top of them.
And where are you going to keep your Segway at work? Good rule of thumb: If your employer won’t let you drag your bicycle into your office, he probably won’t let you drag your Segway in.
How about theft? Is there anyone here who wants to ride a $6000 Segway through just about any neighborhood late at night?
How about shopping, or restaraunts? How can you stop for a bite to eat on your Segway? Going to leave a $6000 machine outside while you eat? I guarantee you the restaraunt won’t let you park it at your table.
How about elevators? Yes, a Segway can be ridden into an elevator. But how do you manoever one in and out in a crowd? how many ankles have to get banged or toes driven over before buildings start putting up signs saying, “No Segways in elevator”? Then the things are useless in the most congested places.
The Segway is a perfect example of a piece of equipment that is brilliantly engineered, but designed with a complete lack of regard for the mundane details that will make it impractical as general transportation.