People have tried that too. In 2004 Kevin Warwick published "March of the Machines". It was an apocalyptic view of what the future holds for mankind - with the superior machines out-competing the obsolete humans - crushing them like ants.

Obviously some DOOM mongers will want their vision of DOOM to be as convincing and realistic as possible. The more obviously fake the visions of DOOM are, the fewer believe - and the poorer the associated marketing. Making DOOM seem as plausible as possible is a fundamental part of the DOOM monger's trade.

The Skynet niche, the Matrix niche, the 2012 niche, the "earth fries" niche, the "alien invasion" niche, the "asteroid impact" niche, the "nuclear apocalypse" niche, and the "deadly plague" niche are all already being exploited by other DOOM mongers - in their own way. Humans just love a good disaster, you see.