Firaxis won't go under. Civilization V is the 16th most owned game on the entirety of Steam with 6 million downloads. Plus VGChartz claims 1.5 million physical sales of Civ V. Then you have to include the revenue from expansion packs and other DLC.
XCOM: Enemy Unkown was also a commercial success, but I can't find any official numbers.
"On my business card I am a corporate president. In my mind I am a game developer. But in my heart I am a gamer." - Satoru Iwata








