I think that DoW & DoM should keep the current storyline, and then DoH & DoL should have a different storyline, maybe one that later ties into the DOW & DoM one so that we can do end quests together. But the storylines for the craft and gatherers could be something with crafting ships to battle the empire or gather materials, ect. That way the crafters and gatherers don't have to be in battles. It doesn't really make sense that they would send crafters out for something like that too.