Fifth Element
Legend
That would not be a good reason to design a whole new setting. Very much "our elves are different" in nature. If there's no spell magic, then psionics are the standard magic of that setting. Writing a new setting just to have a different implementation of magic mechanics would be a strange choice.WotC could do the same thing if they wanted to, bu creating a new setting without spell magic and designing psionics for it, putting the burden of using both systems on the players. But they won't.