Hasbro's already moved some manufacturing out of China according to something Adam Pawlus wrote up recently... A slowdown there isn't going to stop their growing middle-class by any means though. Not to mention Hasbro doesn't tend to use the "cheap" factories. Like a dollar store toy might, for instance. Product costs are up there, and I don't see them going away.
Vietnam, India... If Hasbro moves, they have options, but these companies will still be held to the US standards too, and Hasbro again has always has their own standards that tended to be above. Some of this came about after the whole lead paint debacle a while back.