some got cancled i don't know but all i know is that my favorite old show ed edd n eddy ended in 2009 with big picture show. so i don't know what to say about the other shows.
More and more of them are being aired on Boomerang nowadays. I think the newest show I've seen on Boomerang is Chowder. A lot of the CN original shows older than that are on it sometimes too.