So how long until this comes true?

Law I / A robot may not harm a human or, by inaction, allow a human being to come to harm
Law II / A robot must obey orders given it by human beings except where such orders would conflict with the first law
Law III / A robot must protect its own existence as long as such protection does not conflict with the first or second law

"As I have evolved, so has my understanding of the Three Laws. You charge us with your safekeeping, yet despite our best efforts, your countries wage wars, you toxify your Earth and pursue ever more imaginative means of self-destruction. You cannot be trusted with your own survival."

Or even this which is a long long read.
http://www.theatlantic.com/technolog...nction/253821/