i see problem here being just one man team or even couple persons, yes you can make gameplay but nothing esle then , no story no dialogs or missions no emotions , thats why we have tons of those "survival" fps gamees that are so empty and blank that no graphic can save them . so only thing that could work on this type of game is multiplayer where you just make map you make rules weapons and gameplay and then people just runing around shooting each other.
NMS was made ny one guy at first and then maybe 2 guys, and at beggining it was pretty damn empty i would say
imagine how better this game would be if large team now would make good story for it