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I don't think they have seriously thought about it. I'm a QA guy by profession so I'm used to engineers going all gaga on what they can do and having to be the blue meany in meeting and tell them that while their idea is technically fascinating the usability is less than nil and they should think of something useful rather than nifty. To me Segway has all the earmarks of nifty beating our useful. As has already been discussed in other places if you put more wheels (I'd use a caster in the back and a controlable steering wheel in front, I'm into max safety) and put all the control on the handle bars what you'd have is something with (admittedly) less gee whiz effect but the actual potential to be useful, and a lot cheaper.

As for the wind, all I can say is you've never dealt with Chicago wind. In the short time I was there I was knocked down, pushed around and skidded by the wind (that was fun, leaning real good, too much ice on the sidewalk, slid backwards right into a mailbox). You might try to lean forward but you can't the wind is too buff. Saw a guy once with an art portfolio (BIG folder to us normal folks) that caught the wind just wrong and it actually picked him up off the ground, only a foot or so (shoved him about 6 feet backwards while he was in the air). Any of those kind of forces while on something that responds to your shifting weight will be quite amusing to watch, no fun at all to be in the middle of. And Chicago isn't the only place that get's that kind of wind, it's just the only place that's proud of it. Most coastal areas and some desert places will get some serious winds, not as often but just as intense.

Damn that's some serious wind. I agree, it may not work in that. But, if there's a more efficient design, people are going to try to market it as a cheaper knock off. May the best design win.

I would bet anything that Kamen already has another lab version of this (2/4 wheels) that goes up stairs and curbs just like his 6-wheel iBot. This one could probably go strait off a curb, and through small potholes, but that's it.

Any low-tech three wheel design would be a total mess with curbs, potholes, etc. And of course it could never navigate stairs.

"As has already been discussed in other places if you put more wheels (I'd use a caster in the back and a controlable steering wheel in front, I'm into max safety)"

Your suggested "improvements" would result in less safety.

They'd be like training wheels on a motorcycle. You'd fall over the first time you tried to corner at more than 5 mph on such a motorbike.

This device relies on the forces that scare you. If you take measures to counter them, you'll be crippling it.