Beyond campaigning for K. Rool DLC, if we don't get any DKC newcomers, our attention should shift to "Sakurai Should Develop the Next DKC Game" petitioning. Maybe if the series entered his personal bubble, we'd see two DKC characters in one game, five DKC items, modes based off of DKC, 15 DKC enemies in single player modes, and DKC given the frequent spotlight in website updates.
Namco is really the one who seems to adore Classic DK here. They had Kremlings Ruins, Klaptraps, Dixie and a Swanky Kong billboard in Mario Superstar Baseball, Kremlings, K. Rool, Dixie, Tiny, and Funky in Mario Super Sluggers, and now Kremlings in Smash Run and allegedly Chunky Kong in these games.