The lack of screens, VR and apparently not having any "shooter" elements perplexes me about Mario Kart. Surely there has to be some interactivity of some kind... it's based on a video game, for god's sake!
I would think MK would be an attraction who's purpose is to put you in the middle of a Mario Kart race? That's the only possible selling point. It would be quite boring if they didn't include the requisite thrill behind the heart of the game, which is the competitive nature. This ride, no matter what, for clearly what people desire, can't just be a passive experience. Even if there's randomized elements and points where you pick up speed or entertain illusions of drifting, even if there's full three-dimensional sets and animatronics... everybody will shrug if there's zero illusion of control.
I was imagining the tech used in Legoland's new Ninjago ride which utilize hand gestures. You pass an item block, a screen in front of you shows what you have and you wave/throw towards the vehicle or "set piece" that you want to strike. No scoring is tallied, but of course, the point is getting your vehicle to 1st place.
I know RSR is a racing car attraction that succeeds without giving the rider anything to do, but the attraction accomplishes the feeling of participating in a race around the Ornament Valley. Here you're building from what will be when it opens a 30-year-old franchise that was a racing game with the monkey wrench of using whimsical items to prevent your opponents from gaining leads. With that being a cruical part of the appeal of Mario Kart... well I'm just puzzled here if that isn't a part of the attraction.