RS and AT should have enough time to come up with satisfying endings. Heck, with RS, if it wasn't for the Under the Dome arc, they could have ended at Rigby's graduation, and had it not been for the Rigby's back to school arc, even the movie would be a satisfying end. Gumball seems to be on the creation staff, and recent episodes pretty much show how the show's going to end anyway. And if rumors of Steven Universe are true, as long as they wrap everything up by the end, I'm fine with it. I'm more annoyed by the fact UG got screwed with it's fake renewal of "we have enough episodes in production to split into 2 broadcast seasons." And also more annoyed at the poor treatment of Wabbit, Be Cool Scooby-Doo (as Scooby is WB's personal cash cow outside of DC comics), Tom and Jerry Show, and especially Bunnicula, since unlike the others, wasn't just dumped on Boomerang and just disappeared.
It just feels like all these shows, spread out among the three channels, have been given the axe at once. Plus, I'm sure the way they air Adventure Time, it's more likely going to finish in 2019.