I'd like to see them add some more of the good old Disney shows like Gargoyles, Darkwing Duck, and Bonkers (Who Framed Roger Rabbit) , but if we're shooting for the moon...
anything that would bring a tie in with the wealth of Warner Brothers cartoons. Bugs Bunny, Daffy, Taz, Porky, Tiny Toons, Animaniacs (I love the mental image of Dot jumping Riku and yelling "Hello Keyblade nurse!"). And of course the Warner Brothers version of the DC universe, Batman, Justice League etc.
But yeah, no freaking way. Still, it'd be great to see Hercules and Superman duke it out in Olympus.