Ah, okay. Looking it up they're just going to stop airing reruns. Still shocked. Say what you will about that bald fucker, but 10 years of reruns ain't bad. At least PBS shows some old shows love, unlike certain other kids networks I can name.

So turns out Caillou is universally reviled because he constantly fucks up, whines, and throws tantrums with no consequences. Naturally this causes problems with the target audience:

https://nationalpost.com/news/canada/analysis-caillou-is-an-aggressively-bad-show-ruining-the-worlds-children-and-its-all-canadas-fault