The cynic in me thinks that other countries appreciate Western animation more than North America does, or at least have saner network executives. The people behind scheduling decisions underestimate this wonky thing called "the internet", even though for many cable stations, the loss of even 100,000 viewers can be major.
Although to be honest, what is more frustrating to me about TSSM and W&TXM is the idea that Marvel's animation department has revealed a disturbing lack of patience with any of their recent properties. No animated program has lasted beyond 26 episodes since 2003, and they've had three series since then. They've revealed a tendency to cancel shows that still have potential in the cradle for all sorts of internal reasons that make little sense to a consumer. The problem is it gets hard to have faith in a newer show. Who's to say AVENGERS: EARTH'S MIGHTIEST HEROES will get any patience, either? If the ratings are less than stellar, will all 52 episodes still air? Will the Ellis X-MEN air anywhere or be a direct to video? And so on.
The demise of W&TXM shows that a show can be a ratings success and still be canceled for whatever internal reasons that are going on at Marvel with Disney calling the shots. As in, being a success isn't enough to have patience in a TV cartoon if corporate has other plans.