As long as you're acknowledging the "if", I'm fine with speculation about this.
It's just Metroid that bothers me. The thing is, even though I love Ridley to death, I'm pretty convinced he's not going to be playable now. I really don't think there's any way it will happen. And I don't know what Metroid character would be a possible second (third, I guess) representative to match up to Samus. Adam or Anthony? I hope not. Kraid? He's way bigger than Ridley! Dark Samus is an Assist. The other freelance hunters from Prime 3/Hunters aren't relevant at all. Rundas and Trace gained some brief popularity YEARS ago, but neither has shown up since. The most likely options right now are "generic Chozo" or "generic Space Pirate". And that's pretty sad.
Aside from that though, the rest seem likely. Zelda certainly has a possible "slot" open, but it's not entirely necessary. Fire Emblem will almost certainly get an Awakening representative, I believe that. And Kid Icarus is very likely to get Palutena, seeing as Uprising is Sakurai's new baby. But I still have my doubts about any of these. I think we're all looking too deep, and when that happens, we're on a crash course for disappointment.