I could see these as being very useful in dense downtown areas like New York City - just thinking of the increase in parking spaces!
IF someone was smart, they might try to start something like providing parking centers just outside city centers where one could leave one's auto (if driving from far outside the city) and for a nominal fee "rent" one of these to squirt around in town on, with recharging stations and preferred parking arrangements. It makes more sense in reducing inner city congestion than the Segway gizmo (which is built in our state about 45 minute's drive away from here).