Netflix is the savior.
Serialized shows on TV can't succeed anymore. Kids and teens have so many forms of entertainment vying for their attention that it just doesn't make sense to release episodes weekly and hope they remember to tune in.
However, a massive part of Netflix's success is due to the phenomenon known as "binge watching"-- watching through an entire serialized show or part of it in a single sitting. Shows like Game of Thrones, The Walking Dead, Breaking Bad and House of Cards have streaming serices to thank for their continued popularity.
Recently, shows such as Young Justice, Avatar: the Last Airbender, Justice League, Avengers: Earth's Mightiest Heroes, Archer, and even a slate of original anime shows have enjoyed a resurgence of interest from the teen demographic they were originally aimed at, and Netflix, Hulu and Amazon are constantly looking for ways to expand their original programming lineup.
During the airing of the Legend of Korra, Nickelodeon actually "cancelled" its live airings in favor of streaming release on its own website.
Television is now the domain only of episodic comedy targeted at children with low attention spans, and serialized cartoons can't make the cut anymore. If action shows are going to continue on, they're going to do it on streaming serivices.
