I'd make a space simulation game with gameplay similar to that of 1990s space sims, especially borrowing heavily from Descent: FreeSpace. The story would be amazing, the game would feature the ability to give squad commands to your wingmates, but the game wouldn't be dumbed down like most games nowadays. It would have a killer soundtrack that was very fitting, and in between single player missions the player can converse with his fellow squadron pilots and further romance sub-plots, similar to Mass Effect.
The game would feature a full map editor and fully supported modding tools. The multiplayer would use a service similar to the original Battle.net with chat rooms, friends lists, ladder, stat tracking, etc. but it would offer dedicated server support and both text and voice chat. Even the console versions would have chat-rooms and all of the features that the PC version would. The game would feature LAN support as well as online support, and there would be many pro-gaming tournaments and organizations. Players could play across platforms if they choose to, or they can also choose to just play with people using their platform. For instance, a PC player could play with a PS3, Wii, and Xbox 360 players all on the same server. Console players would be able to download the custom missions and mods that PC players create to their consoles for free, and they would have access to the mission creator, even though they wouldn't have all of the same modding tools as PC players due to restrictions. Would a game like this interest you?