I think with the right concepts for
The Game it would be pretty great. but if it isnt made right a lot of people will hate it. I think the best way would be by making sam and dean as an optional story of to the side after u complete
The Game with your own hunters that you made in the beginning, and in the beginning you can pick how you got into hunting from a variety of different options. and also that when you start and after basic tutorials that you can choose to follow the path of your
Lost father or just go out and casually hunt to hown your skills. The creators would also have to incorporate the impala because fans and myself would be extremely pissed off if it wasnt there. of course i hate to admit the chances of them making a game are slim but people can surprise you so dont lose faith.