Fallout 4 has many aspects that have not yet been explored. Such as aliens, much can be added : armor, weapons, Power Armor, ship creation like automatron, even new races. Their technology has not yet been explored and I think the modding community can use this to create several mods , keeping Immersion . The sky is no longer the limit , because the aliens come from another planet , which means the possilidade new maps technology never before explored , exploration of space, you name it. Modding continues to grow in Fallout 4, which makes this idea more and more a possibility. For those who think that this idea does not make much sense in the game, the Nuka World Dlc shows the idea or the dream of creating a vault space, as an escape from apocalispe, this concept can also be used . Well, this is my idea, I hope at least you guys read it, it might inspire you.
