Well just the fact that networks like cartoon network, Disney, and nickelodeon seem to take out the best shows after one or two seasons and let mediocre cartoons live on for like 10 seasons.
I think he/she's referring to the cancellation of Young Justice and Green Lantern on Cartoon Network - Though I certainly wouldn't refer to shows like Adventure Time and Regular Show (my best guess at the "mediocre" shows ROFLSOLDIER is talking about) mediocre.