I can really understand removing G&W and Y.Link [to replace] but IC are unique, fresh, and extremely original. They have a decent fan-base and really can't be replaced by anyone.
Unless they do something wierd like Banjo&Kazooie[Microsoft], Ephraim&Eirika, or Diddy&Dixie, how to fill that void? Being that they are 2 characters, ignoring the hardship of playing with just one, it's a task learning to do well with them. It's a great accomplishment and good feeling, and I don't think that should be removed.
Baby Bowser I'll take. Since he might just end up a good version of Bowser, faster and weakened, but even a weak Bowser would still be pretty strong.
Celda I'll take. Loved his game and he's not just another Link. He is unique and interesting.
**Warning**
Ridley NO. I know he's in practically every Samus game and whatnot, but he's still just a raptor-like monster. Yoshi is a dinosaur, but he's gotten his own games and has developed his own personality. Ridley....not so much. It's too awkward this kind of 'character' in Smash.