I don't think they are going to play the betrayal card too much otherwise they will overdo it. Personally I think Count Edmont de Fortemps and Aymeric will be our allies in 3.x though it might take some time to win them over. Infact, I think winning over the ruling houses of Ishgard or at least some of them will be key to us ending the war. For all their flaws the Ishgardians do seem to espouse to a kind of noble idealism of justice and honor, its just their zealotry and bigotry blind them to their own hypocrisy. We have certainly meet several Ishgardians that seem to be good people even if their devoutness leads them to be somewhat blind to truths.