Replacement.

[Tupin]

I hope Windwaker Link replaces him because he could have much better (less clone like) moves. ;D

[Nintendo Guru]

Even with his cartoony graphics, Wind Waker Link would still fit pretty well into Brawl.  He is cell-shaded, but it's not like he's 2D like Paper Mario.  I even think that his cartoony graphics would be better than the "realistic" graphics, like in Melee.

Not only that, but the moveset of a WW Link would be pretty cool because of all the cool items from Wind Waker, and it would be easier to make his moveset much different from Link's, unlike in Melee.  In my opinion, Wind Waker Link would make a good replacement for Young Link.

[DarkLink49]

i think he should and they should make young link a  alt costume for Adult Link

[Ridley]

Nah

[Water ☮]

definitely. he could have a move set very different from link. anything to change a clone.