Can A.I ever really be a threat to humans?

Its the oldest Sci-Fi movie theme in the world-the artificial intelligence unit that is constructed by humans and eventually grows so powerful/intelligent that it ends up threatening or enslaving the very people who constructed it.And yet,as I understand the subject,real-life A.I is nowhere near on the level where... show more Its the oldest Sci-Fi movie theme in the world-the artificial intelligence unit that is constructed by humans and eventually grows so powerful/intelligent that it ends up threatening or enslaving the very people who constructed it.And yet,as I understand the subject,real-life A.I is nowhere near on the level where it could pose even a remote danger to human beings.But will that change?Is it realistic to expect that one day A.I units really will pose a threat to mankids dominion of the world?How soon could this happen?
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