They remove my glass cannon build, and we take to the steets.
But I don’t think they’d change any of the core mechanics. Maybe add some side ones, like a boss rush mode, like what they added to the Mario RPG remake.
My 1-in-a-million prediction? Fast travel mechanic. Mario folds himself up into an envelope and mails himself to a town he’s already gotten a crystal star from. (Yes, I know we already have the underground pipes, just let me believe.)