It would make sense to have them all in the instance. Leveling rather fast pace now and with the zones running more smoothely it'll only increase the speed in which you go through the old world. Having the fly all around the world to grab all the quests is a pain that used to be something you did passively because you generally had to visit everywhere anyway.
With the dungeon finder too it'll work well along side quests being inside, just like the dwarf inside Utgarde Pinnacle.