i don't think it's meant to replace walking, so much as it's meant to replace those 2-minute car trips to the supermarket. the idea is that you would choose to own one of these over a car, i believe, not both of them together. if you live in a dense urban setting, i could see where it could be useful.
as for making sidewalks 3 times as wide to accomodate everyone on a segway, i bet that's what the manufacturers were hoping would happen--that highway room might be reduced to make room for sidewalks. from an environmental point, that would probably be a good thing.
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oh baby oh baby, i like gravy.
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