That's probably not a correct assumption. More than likely Cartoon Network is under contract to air all the episodes until the license expires. There are probably similar agreements with Teletoon and in other countries. Keeping in mind that in this instance Cartoon Network likely has little control over production and probably couldn't even say how many episodes they wanted a season. They probably couldn't cancel or pull TCW without facing a legal battle and probably want to maintain a good relationship LFL anyways. If Christian Taylor says he is working on 6 season, I'm inclined to be there will be 6.