"Humans will not be replaced by robots very soon" --- yeah right !!!
Mof...kers did you watch the video on youtube with Atlas doing parkour ?
https://www.youtube.com/watch?v=_sBBaNYex3ESkynet is coming !!! Arm yourself's.
Questions that are quite intriguing and ask questions.
In what way do you mean the role of humans? because your question is quite ambiguous and needs to be detailed again, for example in terms of doing something or as a whole?