Here is the thing: The major TV networks most likely do not think that airing anime would benefit their ratings for their current line-up of shows. For example, those networks that have morning cartoon shows (CBS, CW, NBC, ABC), focus on cartoons that they have a market for and is in demand. Below is the lowdown on the channels:
So other than that, I am not fully sure as to why anime does not get more love in the USA. I wish that more of the networks would air anime so that myself and others could enjoy watching them.
@LuffyDUzumaki: Money. If these shows were pulling in huge ratings there would be more of them on.
I think the internet hurts it. If you got super deep into Bleach on Cartoon Network, you could go on the internet and legally/illegally watch like 200 episodes past where the broadcast is. That can't be helpful.
I think it's because most of the anime released right now is not universal in the sense that is mostly high school echi comedies that most American (or any other country for that matter) people can't relate to, that's why you'll mostly find sci-fi/shonen shows tht aren't so focused in a certain aspect of Japanese culture.