Maybe as an assit trophy, Sure he has some moves that would work well such as the canon gun, crown throw, anything from DK64, hell he could use Clubba's club. There is tons of things you can do with King K Rool. But there's so many other choices that could work well. What makes him more viable than alot of the DK cast other than being the most well known antagonist, Yeah its certainly marketable but but Daddy Sakurai would rather surprise us with a different DK character unless the masses want King K Rool.
Wario Forums
The 3rd Wario Brother
Yikes Spike
Most likely, they would port Super Smash Wii U for the NX, they're planning to do the same with half of the library.
Robin
I voted K.Rool and Shantae for Smash, so yeah, I agree with K.Rool being a character.
JS Shantae
lots of people wanted him. More than Bayonetta I guarantee. But Nintendo isn't trying to sell copies of Wii U K.Rool games, so they ignored him
Robin
Exactly. (blame Bayonetta on Europe, of course)
JS Shantae
every European I ask about this says they sure as hell didn't vote for her and don't know anyone else who did either. somehow I thin k Europe is innocent
JS Shantae
also, Shantae is love, Shantae is life