Ever watched the show Almost Human? If not you may want to, because that is your future in the next 25 years (or less).
Of if you ever saw Terminator with the robot soldiers, that too and Google is working on it right now. Not saying they will destroy the earth, but they will become smarter than humans. They are working on having robot solders. When war loses the human tragedy side it will become more and more used because the human loss will be gone.
But here is also something to consider as robots take over doing many of the things humans do now. So consider this. The economics of the USA and out system. The Federal Gov gets almost all of its revenue from income tax from people who WORK and pay taxes. If robots do all the work (or most of it) how will the Gov get taxes from them since robots will not be making money. I mean surly we will NOT pay the robots with money. And the Gov will still need $$$ to pay for societies freeloaders.
Before you say NO WAY any of this will ever happen. Remember the trip to the moon, flip cell phones, the internet, etc etc. Star Trek will be a reality one day. Space travel at warp speed, transporters, etc if we survive that long.