How elitist. As it stands, if another Smash game were to be made here and now, it is much more likely that Micaiah would get in, and K.Rool wouldn't, and the reasons for that should be obvious to you now. (unless you're just trying to shut them out of your head) There's no where to go with the Dixie argument because its clear from the begining that she has higher priority, at leat in any Smash game Sakurai makes. K.Rool isn't popular, and for the most part, neither is Dixie. The word is getting way to overused. Mario is popular. Pikachu is popular. K.Rool isn't. People who play the DKC games don't play them for K.Rool. They can play them for Dixie, because they play as her, but they can't for K.Rool, who's just another generic bad guy who shows up at the end. Getting into Mario spin offs shows that the character's existance is known by Nintendo. It shows that the character is expanded, and that the repeated use means the character went over well. As I've stated before, every time Dixie has shown up for a non Smash game, she's been playable. Nintendo likes the little ape, and the fact that she had programing in Brawl strengthen this theory.
I had a long post typed it, then it got deleted, really frustrating. Anyway, sorry to sound like an elitist, but you've sort of popped a nerve here, you've managed to get me in a pretty bad mood. Of course I'm assuming the next Smash will be in the distant future, there's no way it's going to happen now. The BARE MINIMUM I'd assume would be four years before another smash is announced. In this time, another FE WILL be released, -most probably- in a new region that is not tellius. The lords from the game will get a fan following, and this severely hurts Miciah's chances. If Miciah is so popular, why wasn't she the assist trophy in Brawl over Lyn? Lyn got her assist trophy spot solely based off popularity. Miciah also has to compete with Sigurd and Roy for the third FE slot, who aren't popular solely because of their game being new and them being female.
K. Rool doesn't have to worry about new characters being introduced to steal his popularity, and the only other character that's already in his series giving him good competetion is Dixie Kong. K. Rool will still be likely when SSB4 rolls around, perhaps even more so. Who knows, maybe we'll actually get a Donkey Kong Country 4? If there is one, K. Rool will more then likely be the villian, but the chances of Dixie being playable aren't guaranteed. I see the most likely pair up being DK and Diddy again, as DK was only playable for the first DKC.
The Ice Climbers are about the least generic character in Smash. Certainly more unique than any new addition in Melee. They fight in tandum, which is a different fighting style that no one else has. How is that generic? K.Rool can't do anything like that. If you mean their personalities, then its like calling Mr. G&W, or R.O.B. generic. The may not have real personalities, but at least they are not dull retreads of the Saturday morning cartoon villain's, like K. Rool.
Nobody's picking up the DKC games for the characters/story, they're doing it for gameplay. K. Rool has just as much of ability to impact sales as Dixie despite not being playable. When you first pick up the game, you might like Dixie's animations and such, but you'll eventually get over them after you see them by the thousandath time, much less at the final boss. In the final boss, you aren't paying attention to your character, you're paying attention to that deadly kremling king who can kill you in two hits with ease.
About K. Rool being a saturday morning cartoon villian, so what if he is? All the other villians are also, except Ganondorf, who comes from a much more mature series. Dixie Kong isn't exactly filled with personality either, she has less so then K. Rool if anything. How so? K. Rool has more dialouge in the DKC games, and in the game with the most dialouge of any of the DK games, DK64, Dixie is absent, and K. Rool's the only one to get voice acting done. If this isn't enough for you and you care about the new games, Dixie is absent from the vast majority of DK Jungle Climber (Getting a cameo in the start) and Diddy, Cranky and, more importantly, K. Rool, all get large amounts of dialouge.
Smash Brothers has also regognized K. Rool's popularity in both his melee and brawl trophies, stating that he's "Picked up quite a few fans over the years."