Given that we do not actually have at hand a solution to ontological crises in general or to the specific crisis that we face, what's wrong with saying that the solution set may just be null?

My answer is that this seems like a severely underdetermned problem, not an overdetermined one. If we start from the requirement that the change-gathering robot still gathers change in the ancestral environment, we're at least starting with lots of indeterminacy, and I don't think there's some tipping point as we add desiderata. Unless we take the tragic step of requiring our translated morality to be the only possible translation :D