Speaking as somebody whom actually liked Skyward Sword’s motion controls, (except the overly-precise harp minigame in the pumpkin bar) honestly the game just wouldn’t be the same to me with standard button controls. They’d also have to redo/change alot of areas, puzzles, and enemy/boss battles, if they do.
I know alot of gamers are mixed on motion controls, (especially now that the Wii is gone, it’s kinda died out lately) but it’d be like trying to port Wii Sports Resort to buttons-only, or getting rid of touchscreen controls for a game better suited for that, or something.