User blog comment:KrspaceT/Toonami post AoT and Dandy?/@comment-7866392-20140714054223

For Space Dandy, assuming that Toonami decides not to rerun the show at a later timeslot when it's done (considering that it's Toonami's first world premiere show, I think it's possible that Toonami might rerun the show for a while), I think they'll probably replace it another world premiere show (I've suggested that such a show would be eith Sailor Moon Crystal or Sword Art Online II, but since it's pretty much too late to consider both shows candidates for world premieres, I have no idea any other show that could be considered a world premiere).

For Attack on Titan (no, it will not stay on the lineup forever, unlike what someone below said), my guess is it will be replaced by a just recently-licensed-and-dubbed show picked up by FUNimation, such as Psycho-Pass.