Power is the limiting factor by far. We've been watching marvel movies so long that we forget that Iron Man arc-reactors are not real.
Battery technology will have to get many of orders of magnitude better for this to become a problem. Or tiny, tiny nuclear reactors. And there is no battery tech that doesn't get really gimpy in extreme weather. Those robo dogs are extremely cool, and creepy, but I'm not losing any sleep.
Unless they perfect robo-river-pirates, then I'm screwed.