In a way, since the Industrial Revolutions, but in an industrial sense.. Not really "taking over" though; that would imply machines controlling man instead of the other way around . Something like the computer HAL did in "2001, A Space Odyssey". We rely too much on machines maybe.
Yes not that that is necessarily a bad thing. Just think about how technologically advance we are becoming imaging what we can do with this knowledge. The medical field is so much better and we have learned so much. Technology is good and it isn't really a bad thing yet.