Motivation comes from our survival instincts. While most robots right now are not subject to Darwinian forces, enterprises are, and one might argue that they are AIs in their own rights.

Economic demand also stems from survival instinct.

Companies are gradually being automated out of economic necessity. For some reasons I don't trust the market to keep on feeding billions of idle meat bags once they are not needed anymore for production.

Currently paying unemployed people prevents them from turning to crime and ensure that society as a whole can be productive. It may not make sense once the vast majority isn't productive anymore.

Humanity is the scaffold of the mechanic beast that's being built.

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Mais l'entreprise elle évolue

Pour mieux pouvoir grandir elle mue

Les pigeons qui vollent à la porte

Sont les écailles de sa peau morte

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Mais l'entreprise elle évolue

Et pour ne pas mourir elle mue

Les édentés qui prennent la porte

Sont les écailles de sa peau morte

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Rough translation: "The entreprise evolves, to grow better it molts, the suckers who are fired are the scales of its dead skin."

For dramatic effect, imagine the above sung looping by a choir that grows in strength until robotic voices join in. Then human voices dwindle.