Okay, I see where you guys are coming from and how many actually like the slightly different styles of the similar (I'll use this term now) characters.
But come on. Personally to me, I'd much rather have a roster of entirely unique characters rather than a bunch of similar characters. I already know it's too late because they have made so many of the same characters with their different touches that there will always be those who can't do without them.
I'll say this: I'm fine with a bunch of similar characters, so long as it doesn't affect possible fresh, entirely new characters' spots, merely because they don't want to lose the different options for a similar character. If that is the case, then I stand by my remove the similar characters or too similar movesets. There would be complainers, but completely unique characters and movesets would always outweigh similars. For example, if you had to choose to either scrap Falco and Captain Ganon or Olimar and Sonic, who'd sound better to keep? The characters who are entirely unique, that's for sure.
But since we're on a more powerful system coming up, that SHOULD mean we would be able to keep everyone we have now and add quite a few. So long as the new characters aren't Tanooki Mario, Paper Peach, and Louie.