What is a video game that you'd love to play, but no one has developed yet?
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A realistic singleplayer shooter game with multiple settings from WW1 right through to the Vietnam war. Extensive maps, vehicles, and weapons. You can play anything from an infantry soldier to the captain of a battleship or pilot of a bomber.
Closest thing to that is the Arma games.
Especially if you could mix and match eras and maps.