"Jack, the hell with incentives, Hollywood doesn't have the ability".
Even if they had the ability, they'd be stupid (economically) to do it, mostly.
I don't agree with your claim Hollywood doesn't have the ability. (Terminator 2 is sort of an exception I think in that any of (1)-(4) (almost) never happen. But then, again the point of the movie is not 'the' AI/robots, but how good Mr. Schwarzenegger is at blowing things up ...)