Bethesda can't do it. They aren't capable of a decent storyline. Their games are frankly beautifully done mostly empty boxes for people to create their own stories and mods in.
Hell, the Skyrim map is just masterfully done. If you follow the roads it seems big and expansive, and the cliffs/mountains exist to force the player to move around them. But there are lots of little paths and ways to shorten distances.
But a narrative driven experience like fo1 and 2? They don't have the skill.