CON > WHM/BLM would be amazing, but they already stated that there are gonna be only 1 job per class at first :/ Also I can hardly see new classes implemented before everything is fixed and this includes the job system implementation...
By the way, bard isn't necessary ralated to instrument, Dragon Age's bard uses bow and daggers and in GW the corresponding support job is Paragon, wich is using javelins.