How would you even put Bowser & DK in Academy (I mean, assuming Ninty gave the thumb's up)? The only times Bowser spoke in full and complete sentences were the weird anime movie from the 80's, DiC cartoons, and Super Mario Sunshine and after that last one Nintendo vowed he'd only do grunts and roars for all eternity. DK's even worse, since his full speech is limited to the infamous CGI cartoon he was in. >.>
Bowser spoke in a SuperChargers comic book he appeared, thought it's different from voice acting.
But nothing can stop him from doing the same he did with Crash. It'll just end up... Unpleasant...