Since you said "they'll surely be in the next Smash game", does that mean you don't think Inklings are on the run for Smash 4 DLC? I will read both articles after launch!
I think Dixie Kong sadly suffers from the same issue as Bandane Waddle Dee, being most fans #2 choice. I have seen people saying they support her, but "they would rather have K. Rool first" a number of times. But on the bright side, Dixie has the fact she was planned to be playable in SSBB in her favor, which means Sakurai considered her for Smash Bros at some point, at least.
Its up in the air for me. I personally think another character will get in as DLC this time around, but I still think its possible they could. I see them as a much greater possibility than "popular" characters like Shantae, Shovel Knight, Banjo, Bayonetta, etc, mainly because third party characters in general have a huge uphill battle, and have to be "an exception" according to Sakurai. But if the Inklings don't get in as DLC, I'm confident they will get in the next Smash game.
If the rumor about "Only two" DLC characters is true, I'm betting that one will be Wolf, and the other will be another first party (Whether its a top contender like Isaac or K Rool, or a mid range popular character like Dixie or Waddle Dee).
Speaking of Dixie, I feel shes another character that doesn't "need" the ballot. She almost found herself into Brawl, and I have a feeling she will find herself in Smash sooner or later regardless.
The next thing I'm curious about is Sakurai saying future DLC being "fan service." Wolf would count as fan service surely. Isaac and K Rool definitely fit the bill as "fan service characters." A comparison brought up on Smash Boards was Wii Fit Trainer vs Little Mac. WFT was not requested by anyone, and is a perfect example of a character that wouldn't fit as fan service. Even Greninja is another good example, since he was selected before fans even knew about him.
Little Mac would be a great example of a fan service character, as he was mostly a retro choice, and highly requested for some time, eventually seeing his own revival. K Rool and Isaac have been missing for some time, yet still keep fans requesting their return.
Hell, Lucas hasn't been in his own game since 2006, and even then his last appearance was in Brawl over 7 years ago, yet fans still wanted him back. K Rool's last appearance was in 2009 and Isaac's was 2010....both smaller gaps than Lucas.
Edit: If theres one character I can say for certain that doesn't deserve to be in Smash, its Shovel Knight. I've already posted the points brought up against Bayonetta and Shantae above, but Shovel Knight doesn't even come close to what those characters have.