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It seems like if they get popular they're going to run into problems with sidewalk availability. We're already using them for walking. You can add a few robots and not have any blowback, but once the novelty wears off, having to navigate around slowpoke robots on your walk is going to get old.

Cities are not immutable objects. It's going to be extremely contentious, because all local politics is, but it's not infeasible to alter our cities.

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