As a writer, the path of least resistance would be to frame this piece along the lines of small robots assembling themselves, then building bigger robots, then taking over the world. The old robot-overlord routine.
But these MIT- and Harvard-developed self-folding robots -- cool as they are -- don't look all that menacing quite yet. For starters, one of the key ingredients is polystyrene, which is the same stuff used in Shrinky Dinks. That's adorable. Second, it takes around four minutes for the things to assemble and start walking away. And third, the assembly has to be pre-programmed, so there's still some human intervention.
Thirty years from now? That might be a different story. I'll be retired (or homeless) on a beach somewhere, though, so I'll just head for the water if these things start getting uppity. They can't swim, can they? Can they?!!
In the interim, the researchers envision self-assembling structures that could be used in dangerous places like space or battlefields.