I’m slightly confused with that justification by Gorsuch. Prop 8 already put forth a production ban in California, so the health interests of Californians should already be served. Prop 12 affected the health of residents in other states.
I agree that this was clearly not about serving the interests of non-human animals, and therefore doesn’t really serve as precedent for granting animals moral rights or weightage independent of voters caring about them.
Sounds like a very interesting and important question! One suggestion: why don’t you change the question to “If AGI goes well for humans, what is your likelihood that it will also go well for animals?”. I think this is an easier question to evaluate then assigning a likelihood to a likelihood. Like if I think there’s an 85% chance of AGI going well for animals, I’m sort of unclear what number I should give for the original question.