Another argument that fails is that sufficient amount of evidence might possibly cause convergence of some priors - but first our evidence for gray goo or fai is barely existent in any way, and second even infinite amount of evidence will leave far too much up to priors - grue/bleen Bayesians will never agree with green/blue Bayesians.

Even if Aumann threatens to spank them and send them to their rooms for not playing nice?