Saturday morning American broadcast TV was once animation's home field. Filling a cereal bowl with artificially colored sugar pebbles and staring at the tube was every kid's weekend plan. Not any more: For the first time in 50-plus years, you won't find any animation on broadcast this morning. It's the end of an era. Yes, The CW, the final holdout in Saturday morning animation, ran its last batch of Vortexx cartoons last weekend. This week,where you once saw shows like Cubix, Sonic X, Dragon Ball Z and Kai, Digimon Fusion, and Yu-Gi-Oh!, you'll instead find "One Magnificent Morning," a block of live-action educational programming. It's the end of...