Here's an interesting discussion of how there are significantly fewer kids watching Saturday morning cartoons.
"Six key factors have led to children watching less Saturday morning cartoons: more recreational sports, the introduction of cable and satellite TV, the Internet and video games, a poorer quality of animation, and a greater emphasis on family time. These factors are rather self-explanatory with the exception of the latter: the divorce rate of Americans now stands at 49 percent, and time on the weekends has become more precious for children as many commute between parents’ houses. For parents who only have limited access to their children due to either divorce or career advancement, plopping them down in front of the television for five hours on a Saturday morning is no longer a viable option. Among most parents, divorced or not, there is a new emphasis on "quality" time. Consequently, taking one’s children to the theater, mall, museum, event, zoo or beach on the weekend is deemed more appropriate to being a "good" parent, than letting kids sit and watch cartoons. To this effect, American society has changed substantially enough over the last two decades to the point where Saturday morning cartoons are less important to our culture."