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Lewis, at least, argued for modal realism on the basis of various theoretical payoffs (accounts of propositions, properties, etc.) that would be completely undercut by the loss of a plenitude of worlds. Things might be different for someone who accepted modal realism on different grounds, e.g. skepticism about abstracta. They would then be subject to the epistemic objections Ross raises. If my account (of when it's legitimate for a theorist to reverse the metaphysical and epistemic orders of explanation) is correct, then it would *not* be legitimate for your kind of modal realist to offer the Lewisian inference, "talking donkeys are possible, therefore there's a concrete world containing a talking donkey".
Toggle Commented Dec 12, 2009 on Modal Realism and Oracles at Neurath's Boat
One shouldn't take "oracle" talk too seriously. It's really just a shorthand to get us thinking about conditional probabilities/credences. E.g. Cr(Modal Realism | only one concrete world) is near-zero, whatever one's prior credence in Modal Realism. By contrast, Cr(Utilitarianism | murdering Bob increases happiness) = Cr(Utilitarianism).
Toggle Commented Dec 12, 2009 on Modal Realism and Oracles at Neurath's Boat