Season 6... any chance at all?

So with the success of season 5 (ratings/views) shouldnt they think about more seasons? The ratings are through the roof. They have to be making money. I know its marketed towards an older audience but there has to be merchandise they should be selling too. Is there something else Tartakovsky is doing that would prevent this? Hell even if netflix or hulu picked it up. I know Tartakovsky wanted to give it a proper ending and all but its doing so well i would think they would have to at least consider more seasons or even ..... a movie?