You have to understand that the revival is predicated on a mysterious and largely mythical notion of the 'ultimate performance', one to which every other rendition is crap in comparison. It's a fleeting thing this peerless song and impossible to pin down but it informs every debate on the subject.
The BBC, or any other broadcaster will get nowhere trying to please advocates of this myth. You could stick a £10m budget in and have three years in the making and someone would pipe up that Fred Slagg's spoons epiphany of 1973 wasn't mentioned and they'd thrown the TV in the canal as a result. What's needed is a folk revival historian, someone who's outside of vested interests, to anchor a weekly series on where English folk is really at today.