Fixing Ganondorf was never really on the table anyway. He's mostly better in terms of competitive ability, but he's actually a physical brute after Melee anyway, as he was already being designed with physical attacks in mind. It's no wonder Nintendo didn't mind him being a Falcon clone. He was already going to start kicking and punching since Wind Waker and Twilight Princess. Some of his new physical animations are from TP, after all.
Even his "most iconic move"(which is turning into Pig Ganon, not Dead Man's Volley) is barely notable on him anymore. Phantom Ganon has used it in 3 canon games where Ganondorf(not Ganon, the Gerudo only) used it literally once. Twinrova has used it too, who is probably the one who taught it to him anyway, since she taught him magic(of which he uses anyway regardless). The closest thing to Ganon himself using it is actually Yuga Ganon, who basically is Ganondorf's hard counterpart and absorbed Ganon separately(note that he is not Ganon's counterpart, as he's not a Monster form either. He was never designed that way. There is no actual counterpart to normal Ganon in ALBW) to do so. But again, that's just a Ganondorf alternate universe character using it, which makes sense. It's pretty specific to the human versions as well in that regard. Not saying the move wouldn't make sense on Ganondorf though(though it really doesn't work well for Smash on its own, since it works in a particular way that makes it a poor projectile. It's great for boss fights. It's terrible in fighting games since you're spending a bunch of match knocking it back and forth. He has another similar projectile that just stuns and is also an important move he uses in OOT, the equivalent to the blue energy balls that Agnahim uses... since Ganondorf copied both techniques to make a boss battle more fun, anyway).
Likewise, Ganondorf's old moveset won't be transferred over to another character. He's associated with it in Smash under Sakurai. Under a new director, sure. But characters are not actual functions here. They're characters who are notable because of the way they play, regardless if people like that particular playstyle or not. This is what defines them in Smash in the end. This is why people were not pleased with the concept of functions when tons of important characters were completely cut in Marvel VS Capcom: Infinite. MegaMan's cut in 3 pissed people off for the same reason. The moveset is not the same thing just cause it's there. It's all about who uses it too. This is also likewise the exact reason people want more accurate movesets, because the moveset is just that important to a character.
The best you can get to reuse an old moveset is perhaps an Echo, who has the same proportions but is somewhat different. Ganondorf's Brawl/4 moveset is the same one(though with the weight/speed differences, it'd probably be treated like a regular Clone officially) overall in terms of "it's a Ganondorf moveset", but you could throw that pretty well onto Black Shadow while not messing with Ganondorf's playstyle in general. You'd get both movesets, while not alienating players. It's worth noting that a character introduced that has an eh moveset that some don't like wasn't going to alienate people magically cause it changed again. They were already not interested. In other words, it goes the other way around. Massively changing movesets doesn't actually gather new people overall, it alienates the current players more. Smash is a casual game first, which is what is appealed to. That's why the movesets are only somewhat updated so everyone can easily adjust to. Even then, some might be more alienating than intended(the latest Link and Ganondorf, and Bowser since 4, are a lot more difficult to adjust to than, say, Bowser in Brawl, Ganondorf in Brawl, or Pit in 4. They need a new way to approach). Should they have been changed that much? Debatable, really. I'm not sure how many switched characters outright, as I barely have any actual notes on that. I only know one person who went from Link to Young Link in Ultimate, but that means little overall.