Nickelodeon may seem cute and lovely on the surface, but in reality it's a harsh, Darwinian world of good shows, bad shows, and horrible shows. Remember Rocket Monkeys? A show Nickelodeon hyped to heck and back all the time? It's gone now. It died because it failed to attract viewers. It failed to attract viewers because it was a badly made cartoon. Even though Nick greenlights many shows, it can be observed only some of them make it to be highly successful, and those that become highly successful are good. Even Fanboy and ChumChum, an infamous pandering show infested with mindless gross-out humor and mind-numbingly fast-paced antics, with no decent morals, which lasted 2 seasons, has finally died off as the kids moved on to more quality programming they could watch with their siblings, too, like The Legend of Korra and Teenage Mutant Ninja Turtles, both of which feature great writing and visuals. This new "Breadwinners" show on the other hand, is horrid-looking and random.
Cartoon Network, by this logic, is an example of cartoon selective breeding, as they eliminate otherwise good pure action series in favor of comedies, regardless of their following, yet regardless the comedies that thrive also have action elements, and those that do not are subject to the rules of standard Darwinism: if it's crud, it's dead, as Robotomy and The Problem Solverz prove. Johnny Test is a mysterious exception, but that's because it's from Canada. Initially, it seems like the rules are backwards in Canada, but in reality, Johnny Test is an example of a Darwinistic survivor as well; much of it's brethren, including shows like Scaredy Squirrel, are even worse than it is, and many a bad series from the U.S., lacking the "so bad, it's good" charm Johnny Test manages to maintain. Further, the Test is very cheap to produce, leading to it's use as cheap filler.