That can happen with any creative endeavor, and if it happens, it's better to move on than to phone it in. Cartoonists are a good example; Watterman and Larson

That can happen with any creative endeavor, and if it happens, it's better to move on than to phone it in. Cartoonists are a good example; Watterman and Larson did the right thing by retiring rather than letting their strips go stale. Groening, on the other hand...