One of the great things about the Roomba robot vacuum cleaner, which my company iRobot designed, is that it's too cheap not to be autonomous.
The most important thing for building a robot that you can interact with socially is its visual attention system. Because what it pays attention to is what it's seeing and interacting with, and what you're understanding what it's doing.
The question is, you know, will someone accidentally build a robot that takes over from us? And that's sort of like this lone guy in the backyard, you know - 'I accidentally built a 747.' I don't think that's going to happen.