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In some places to put this robots on the street is a bad ideea :) Some may adopt them without permision :))

i dont think it would be an issue for the sidewalk really.. at least not anymore so than any baby carriage would or wheelchair etc. it's a very small device :)

I belive that future city will be build in a diferent maner, with small underground tunnels wher you can build a robotic infrastructure, like tesla tunnels but smaller with building to building connection.

i think the best market is one that offers competition to the consumer, you and me, so i suspect that there will be multiple methods of transportation :)