A washer+dryer is pretty huge already. Seems like it could get some robot arms without changing the form factor dramatically.

That said, I think this is way farther off than anyone thinks. I want to know what the maintenance schedule looks like for robot arms. Looks like a lot of small moving parts. Probably a lot of plastic gears.

In an industrial setting, sure, maintenance is just an expense. But wheels require less maintenance and factories can be designed around the robots.