My heart will always pine for a Champion as the next Zelda rep, even if I'm the only one who feels that way.
It'd be fantastic if the Zora or Gorons got repped. We got four unique characters representing four different iconic Zelda races through the Champions, and it'd be a shame not to use at least one of them in Smash.
Nah, there's a lot of people who want to see them as newcomers and were disappointed that they weren't. From a gameplay/franchise stance of them having some unique moves and bringing some new Zelda races to the forefront, I can understand that. Especially since they're brand new and exciting characters.
In context of their game, though, I'm not very emotionally attached to them. Story and characters were one of BotW's weakest points, in my opinion, outside of Zelda's character journey. The Champions are all very one-dimensional and cliche, and don't get a whole lot of screentime. Hence why Champions Ballad was invented to find a way to give them more spotlight, but it wasn't anything that actually developed their characters further or made them more interesting. Just gave each one an action scene, primarily.
I'd prefer characters with a little more substance and depth to them, like Midna or Skull Kid. Not that that quality matters much in regards to Smash, obviously, but in terms of how interesting they are and how easy it is to be emotionally attached to them, they're higher up on the list.