I was always excited about the game, but was afraid it will flop critically. Now that it's getting good scores and a lot of praise, I think it can sell a million copies. I would guess that's a breakeven point for them, actors are not very expensive and about $20-30 million budget is perhaps what it cost.
It could start a franchise if it sells 1M+, but I don't know how demanding is the development and can they produce it on a 2-3 year cycle. I already compared it earlier to Wrong Turn movie franchise, so that's the direction it probably could go: same title, different cast, different predicament...