Opinions are in bold yellow.
Realistically, however, it's understandable.
To answer your comments:
DK wouldn't get any new characters if it hadn't been revived recently. But it has, so it stands good chances of getting a single character as a nod to its glory days. Anything more than that will be seen as focusing too much on a franchise that is, put bluntly, a has-been. If the Returns series continues strongly, I can definitely seeing it get more representation, but it's simply not on the same level of popularity of Mario/Zelda/Pokemon to justify the development hours for more than one character. And yes, you can point out Kirby but Sakurai reserves the right to **** over the other franchises for the sake of his brainchild.
Warioware and Yoshi won't get reps because that's all the representation they need. Yoshi by rights shouldn't even have his own logo, but snagged it in 64 just as Yoshi's Story came out. Warioware just doesn't have any characters that can compete with the big league icons for a spot.
Mario and Pokemon are justified with having 5-6 characters because they churn out new main games every few years, with a crapton of spinoffs and other merch ops in between. Zelda deserves at least 4 because even though it isn't as prolific as Mario and Pokemon, it's been there from the beginning and still has regular installments. Compare this to Starfox, which has only been around since the N64 era and stopped making new games five years ago, and it's pretty clear how incongruous 4 reps seems. Especially since Kirby and Metroid have twice as many games.
Chrome is no more a guarantee than any other character, but if FE representation continues in the same vein as it has for the past two games, he's in.
I probably should have specified what I meant by it doesn't matter. It doesn't matter to me which new franchises are represented. I think they're all equally deserving. It definitely does matter which to ensure better profits, but I don't think we're in any position to make anything more than the loosest of judgments. It's literally a coin toss, where the coin will probably be poked by Sakurai's ego somewhere mid-flip.