Give him his own game. Give Dedede and Meta Knight their own games, too.
Well, Dedede technically has one (see Drum Dash Deluxe), but as for a platformer, none yet minus the sub games. But I do think Dee should get one in the next platformer.
Warning: Crazy guessing ahead, but I'm just gonna cut loose and have fun with it.
I am starting to suspect that Dedede is up for getting a proper game of his own soon. My reason for this is that a suspiciously huge number of HAL's official Behind-the-Scenes Miiverse postings for Kirby Triple Deluxe, Kirby Fighters Deluxe, and Dedede's Drum Dash Deluxe have quite a big focus on the penguin. One recent one even said how they'd made it sound like a game (they were ostensibly discussing Kirby Super Star Ultra) was all about Dedede, along with noting that, in spite of being friends with Kirby, he's still his rival and he's not going to give in until he bests him.
The hints are enough, but then I ended up combining this with the other hints they've been dropping for a while - the ones about Dark Matter. This prompted a realisation: There is only one circumstance under which Dedede could possibly best Kirby, and that is if, unlike the previous Dark Matter invasions,
Kirby was the one who ended up possessed!
Can you imagine both how dangerous that would be,
and how good of a setup that'd be for Dedede taking the helm, and for Bandana Waddle Dee getting his Meta Knightmare/Meta Knightmare Ultra/Dededetour! equivalent?
Yes, I know it's crazy reaching. Let me dream. At the very least I did base it on real hints that have been being dropped.