I'd love to see it happen. It seems there are many cases where I'm the "take what you can get" sort of person, and since a new Wario game may not come soon, I'd like something.
That sounds like a great idea, especially with the zero-gravity mechanic highlighted in MK8!
You could have Orbulon in his ship, Mona on her bike, Dribble & Spitz in their cab-- hey, maybe even Ashley on a Cauldron Kart!