I guess it's more difficult than ever to try and pound through the ever decreasing attention span of the modern televiewer with real science. That's why so many of these shows seem so repetitive and feature the same "celebrity" scientists saying the same things. There's only so many ways you can make a show about supermassive black holes, killer asteroids, and quantum time-travel - the only things that seem to be exciting enough to capture the attention of enough viewers to pay for them. The days of a super-scientist like Carl Sagan actually teaching us something in a show like 'Cosmos' on PBS - with no commercial pressure - are probably lost forever. Thank God 'Nova' is stil alive and kicking (one of the big reasons why I still make my annual contribution to PBS).
Nevertheless, in this era of a "War on Science" being waged by some of our political leaders, any emphasis on science education, no matter if aimed at a 5th grade audience, can only be helpful. Beats shows about cupcakes, deranged hoarders, and people living in swamps doing various disagreeable things to wildlife which seem to fill up an increasing share of the cablenet universe.