'We need to go back there'.

I agree with you that the 50s and 60s were halcyon days for trad music from the British Isles (from what I'm told - I was born in 1977!) It'd be great to see a second folk revival along those lines and I think we're actually experiencing one of sorts as i write. As Lady Penelope pointed out there ARE a damn sight more folk festivals than rock/pop festivals. I can't remember folk music ever being covered as much in the media as it is now. But let's face it, even back in the 50s, 60s and 70s it was hardly mainstream compared to, say, the Beatles or the Stones. Or, to pick two particularly piss-poor examples, the Bay City Rollers or the BeeGees.

Making the Glastonbury Festival into some sort of quota-based 'Anglicana Fair' (even if such a thing were possible) is only going to reinforce the view of many people that folk can't survive without external funding and the goalposts being shifted in its favour. Education and outreach (in schools, for example) is a different matter, but you're talking about a private event for paying punters.