two words
online streaming

CN has figured out that most kids prefer to watch cartoons on-line, and the only kids that still watch regular TV ar ones who are still too young to browse the internet or have a smart phone
And thus the TV schedule reflects it

As for the other show, CN prefers to focus on the official Cartoon Network app, legal streaming sites, and on-demand broadcast, instead of standard TV broadcast, as they know that the fans of those shows do not bother to watch TV in the first place

I just wish they would relax with it a little bit. They still have an audience that likes to catch some random episodes of Gumball on TV when they can, but I guess we're outnumbered, huh?