"We're blights on the universe?" If you really think so, do us a favor and commit suicide. I have no business with people who can't even respect themselves on a innate level. I really hate this conversation right now, can anyone come up with an original idea, all I see is this stupid, derivative "Robots will wipe out mankind, since mankind is a plague."
Really, any intelligent AI we develop will be limited, since the "rise of the robots" idea has existed from the industrial revolution. People will be afraid of intelligent robots, so they will limit them early on. Think of Asimov's Laws of Robotics, that's pretty much an accurate view.
Besides, no one would put a "real" AI in a service robot. Why have a machines that's smarter than you need it to be?
If it's at all possible, there is one field I would like to explore, Sex Robots. Not these primitive real-dolls, but something which seems as real as any human. Some problems with weight (which is a strong consideration considering various sexual positions) and energy sources, but it's not a highly explored field. Doesn't have to be very bright either, just bright enough to seem real. Consider the freedom it would give people, 'real' sex without consequence, no risk of STDs, no need for prostitution; the largest problem would be main-stream acceptance.