There's only one problem: If the Segway runs out of batteries, its gyroscopes stop and it immediately falls over.
Well the Segway kinda had this problem... it wouldn't run out of batteries tho. The originally marketed Segway did not have a cutoff system in
place, so when the batteries dipped below a certain level needed to maintain position, the motors would try to draw more current than available and
wouldn't be able to right the unit.
This problem is very easily solved, and although Im not up to date, Im sure it already has been. All they would have to do for these robots is have
the bot return to a charging point when remaining battery life reaches a particular threshold, or just strap a solar panel somewhere (if daylight
operation) so it is constantly charging. If it ever got into a situation where it could not return to a charging station, the bot could easily lay on
its side to let its batteries charge, and then right itself when ready for action.
As far as little bots being based on the design, they would be VERY effective at maneuvering and rapidly changing speeds. Embedded computer systems
have advanced significantly in the past 5 years, and one of these little smart gyrobots roaming around would be able to perform all sorts of
impressive acts a 4wheeled bot or walker would not be capable of.
As far as being used in actual battle situations... I doubt it would be anything more than what some of our current warbot concepts consist of.
Basically mines.. sitting around waiting for a target to destroy. Throw some big knobby tires on them and they might be of use in a desert arena for
recon work. However I still think their most useful purpose would be in controlling the civilian populus in a city setting.