Nothing about this show is completely story-driven (not a problem, as the show is still hilarious and engaging for that, IMHO.) and I wish more people in this fanbase could accept that, honestly. To be further honest and think harder about some things, I don't mind if they don't do anything with Evil Morty anytime soon - that Citadel being under his control sounds like as happy an ending as said miserable place is ever gonna get, anyway!
Too bad I don't trust Dan Harmon (fucker that he is) to live and let be, when he could focus on helping out in making this show funnier and more engaging for those disappointed in Season 3, knowing he's still on it and sharing space with the real brains behind this show (e.g.: Justin Roland.).