The USFG is "an execution company," not an "innovation company." If we had diverted 50% of CPB's budget a decade ago to funding "new technologies for public interest educational programming," it's very unlikely it would have turned into Wikipedia or Khan Academy. PBS is an extremely successful program whose benefits don't show any signs of slowing down. Eventually, it will evolve or be replaced by something better, but there's no reason to get hasty with that. I watch Nova pretty regularly on my appleTV. They don't seem to be anywhere near technological obsolescence just yet.