The way I see it, Smash Bros should be about representing the variety of Nintendo games on offer. I'd much rather have characters like the Wii Fit Trainer and the Villager who aren't your first thought for a fighting game, then yet more Fire Emblem or Zelda secondary characters who are only in it because they have swords.
There's still some great Nintendo franchises not represented. Punch Out!, Pushmo, Staffy!