Eh... If they're inseparable, then it'd feel like they just brought them back for the sake of having them in the game. If the Ice Climbers are just one character, then it just wouldn't make sense. This thread has me thinking about a "for NX" edition which wouldn't have to worry about the 3DS' processing power. At this point, I'd just wait for that. Same for the Chorus Kids, assuming they had the same problem.
If/When we get 3rd Party Ballot Characters, probably. She's not the most popular 3rd Party there, but ignoring Banjo and Sora, she's neck-and-neck with Bayonetta, Rayman, Snake, and Shovel Knight for the top spot. If we get a 3rd Party Ballot pick, it'd likely be one of those 5.
It wouldn't be a "new" Smash Bros., though. At least in my eyes, this hypothetical "Smash Bros. for NX' would just be Smash 4, but with all of the DLC on disc, as well as the content from both the 3DS/Wii U versions, modes included.
Every successful fighting game gets a "SUPER Edition" roughly a year or 2 later. SFIV went through several iterations, Skullgirls is on its "2nd Encore,", MK9 got a "Komplete Edition" a year later and a Vita version with extra challenges/costumes after that... With MKX already having 4 DLC characters plus 3+ characters that have at least one full variation in the story mode but aren't yet playable otherwise, that rumor saying SFV will only have 18 characters, and KI being comprised of 2-3 "Seasons" worth of characters, I can guarantee you those games are getting them. If anything, it's weird that Smash was an exception. With DLC, a "Complete" Version was almost guaranteed. A "for NX" version at least makes it justified.
Huh. I mean, I though Ike was implied to be bisexual, but I never played his games (And again, it's just an implication, from what I've gathered). IIRC, he can only S-Rank with men, but still flirts with female characters, right? I mean, I learned about this through a long, heated, 3 AM discussion about which Smash characters have and have not "had," which got bad enough that we needed a whiteboard to keep track of everything. Granted, we know Ike reproduced thanks to Priam, but if I'm wrong about his sexuality, that whole night will feel wasted.