I wouldn't want the movesets in Smash totally upended. With a few exceptions, like the FLOOD water canon move for Mario, I liked the sets. Don't change then, just add to them/refine them.
Also, I don't want Mario U to be another "Magic castle with doors/painting" affair. I want to roam around a huge outdoor Mushroom Kingdom, not a castle hub.
And no offense, but I'm really not up for a remake of DK64...........................ever.