Titan was basically the victim of the fight between Gendy and the management of Cartoon Network. The show was cancelled because "they couldn't figure out how to do a toy tie-in", but it was really because Gendy wanted more episodes to finish the story right and they wouldn't give it to him, so he finished the run and went to Sony Pictures Animation. It's really because this has happened before: Samurai Jack was abandoned because it wasn't making tons from it's merch ether, despite getting numerous award nominations.