I really miss the old job quests a lot. Some of my absolute favorite storylines have been in the job quests and it was nice to have stories that don't involve high stakes like saving the world/universe/a nation. I know it's a lot of work, but it would be nice to see even a single quest per expansion over what we get now.
As for the DoL/DoH quests, if they don't plan on doing more of them I wouldn't mind seeing them make the guildmasters custom delivery clients. It would give us a reason to talk to them again and keep them somewhat relevant. Sure they couldn't do them all in one expansion, but since we're lucky if they get a couple lines of new dialogue every four years this would be a good trade off.