Well I understand the cool factor there. But that seems like a lot to have to deal with. Using your keyboard, mouse and 2 or 3 touch screens? I'm not a spring chicken anymore. I don't think I'd be able to compete in a game like that.
It would also alienate a large portion of the playerbase. Touch screens will probably be more affordable in 3 years but as it stands right now, it's still a large barrier to entry and there's no crystal ball to say what it will be like at this game's launch. Too risky. Not a good use of resources in my opinion.