a) Decouple the value of human life from labour.
b) Watch as the value of human life rapidly approaches zero.
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Though I'd expand this by adding "technically alive" is not a very good standard to aim for. Ostensibly we're already heading for something like poverty level UBI + living in pod + eating the proverbial bugs. We need a level above that!
A great exploration of the pitfalls of "preserve humanity" as a reward function is the video game SOMA. I think you also need "preserve dignity" to make the life actually worth living.
(Path `a` is not without its pitfalls: what lack of survival pressure might do to the human culture and genome, I leave as an exercise for the reader! But path `b` I think we already have enough examples of, to know better...)
