I think I'd prefer this if it was more arcade-like, but I don't think I'd enjoy a strict simulation-type game. Remember Snake? Going around eating things to become stronger is a fun and primal concept for games, and I think it has good potential in general. I'm not saying this has to be an arcade-style game, it's just that I personally like the idea of running around hunting animals, maybe eventually graduating to humans as some others have suggested.
Oh, and I suggest not merely restricting it to wolves. With good animations for various creatures, and data on their strengths and weaknesses, you could let players be dozens of different animals.
With a cheat code to play as T. Rex, I would definitely buy this game.