I honestly would have guessed that "Sesame Street" would have ended after Season 50, but after finding out last weekend about being renewed for five more seasons (albeit on the HBO Max streaming service), it must imply the show was doing better online tban on television.
But yeah, I personally think "Arthur" should end its run after Season 25. The producers must be running out of ideas by now, plus the longtime voice actors (for Buster and Muffy, to name two) are up there in age. Or, like will be the case with "Sesame Street", continue the series but only on an online streaming app.