‘A robot may not harm humanity, or, by inaction, allow humanity to come to harm.’

Hmmmm... We're heading for a future where this rule will be thrown out the window.

For example, the Google project of Driverless Cars. When driving, there will be situations where an accident will be inevitable... and the Artificial Intelligence Algorythm will have to decide between risking killing the car's passengers... or innocent bystanders. One thing is certain, it will be a scary future, full of unknown variables.