Forget guns, power armor and vehicles! Make Fallout 4 a survival game in the wasteland. Take the best elements of the survival game genre (like the wound location, bandaging, and infection effects in NeoScavenger). And give it a combat system like Age of Decadence. Make firearms and explosives extremely rare. Make gasoline nonexistent. Make it a difficult process to find clean water and purify it! Give us a longer day cycle! Make resting and sleeping important and the lack of them have consequences! Make food important for survival, not as a health buff, if you don't eat you starve! Make clothing, shelter and crafting a bigger part of your survival! Weather and environmental effects that damage or kill. Radiation poisoning that rarely mutates but has more realistic effects(i.e. hair falling out, burns). Make one of the most powerful weapons to craft a metal tipped spear. or a roughly forged metal sword! Make the best ranged weapons crossbows or flintlocks! Now take all this and put it in the Fallout universe. Make it a single player sandbox Fallout masterpiece! That's the game I've been waiting for!