Blue, you are kinda being a hipster. When you think a clone that got replaced with a better version has more of a chance than one of the most requested Ballot fighters of all, that is so obviously being a hipster. What really makes Young Link any more likely than K.Rool outside of being easy to make? Why should Sakurai bring Young Link back when not many people would use him anyways, there's characters far more people want than him, thus more profitable, and he's already been replaced by a better version? Toon Link is a better Young Link, and since Toon Link's back, there's no reason to drag the inferior of the two back because he's "popular" right now thanks to MM3D.
If we get Ballot fighters, they need to be unique from characters in the base game in order to stand out enough for someone to consider dropping money on them. Ridley and K.Rool would sell amazingly well, but Young Link probably wouldn't. He's a veteran, but Toon Link already is everything Young Link was, but better. And the whole mask gimmick's dead because, guess what, kinda can't do transformations in this game. Did you see the ****storm that erupted when Roy got leaked? Young Link would cause the same reaction.
And if we get any other vets back, I'd think Wolf and Snake would be most likely, not Young Link or Pichu.