At the end of the day, both Toon and Young Link will NEVER be far from their already existing cloney state. They well both always be extremely similar to Link. Unless Sakurai changes his tune, which I don't know if he will. I HOPE he does, because to be quite frank, I don't see Wolf of Falco leaving to be replaced by Krystal anytime soon, so we'll be stuck with those clones.
On top of that, as much as I would like to see Tingle, I figure that if Zelda stays with four characters, already existing "Smash" characters, with an already existing fanbase is a much safer choice than the beautiful Tingle. Because, not everyone sees him like I do.
So, yeah. You can support the likely-but-cloney Toon Link all day long, but that's what he will be.
You could also support the Unlikely-but-not-cloney Tingle, or really any otherZelda character you please, just remember, they are what they are.
NOT LIKELY.
Sakurai loves zero fun.
I don't see why we need 2 Marios
You're right. We also don't need two Links.