[Potato]

Sad to say, currently, the action/adventure genre in the U.S. IS dying. BUT, this has occured so many times in the past. It comes in waves. It seems to happen every 4-6 years.

Right now the only action cartoons in production are Avengers, TMNT, Korra, Hulk, Max Steele, Star Wars and Ben 10 (off the top of my head) and some of these won't get renewed. Batman and Spiderman are pretty much done and in post production. There aren't any new action shows in the pipeline or pre-production (other than Star Wars and next Transformers (back to 2D)), so we're gonna be heading into an action dry spell within 2 years.

Studios are currently just not interested in pursuing action genres due to lack of toy sales. They all say the same thing... "We're currently only looking for comedy shows"
Oh well. After Korra, I might have to settle on Bubble Guppies or Dora the explorer.