> Supply of PBS quality content is a solved problem.

Not really. Nova, for example, has gone downhill quite a bit in the last few years, in that the content has been dumbed down more and more. It tends to candy-coat things and the host will say things along the lines of "golly gee whilikers!" It's a step above Sesame Street, but not by much.

There are some exceptions. The one about the evolution of language was pretty good, although the information content was thin gruel. It's like butter that's been spread way too thin.