Wouldn't it be an even bigger economic incentive to not have to go through this inefficient humanoid interface? Anyway, even with the constraint of being able to operate human interfaces, a robot can look many different ways. Like most of the torso just doesn't make sense for a robot.

There's also a ton of obvious improvements. 360 degree vision. Put a camera in each hand too while we're at it. CCD sensors and basic lenses costs next to nothing and it's very easy to replace.

I suspect that if/when we get to a world where it makes economic sense to manufacture billions of robots, it’ll be easier and cheaper to modify the infrastructure.