I think the major issue (that several have already highlighted) is that there is just so little TV broadcast space given to English folk that a single one-off Christmas special is unlikely to be capable of appealing to and representing everyone..
If i'm being a grumpy young get i would say it seems a pity that the only TV programme we've got had to be an "ironic" "good old days" romp.. And that out of fear that more traditional music and musicians wouldn't appeal to the moron on the street we had a slightly unbalanced cross-section of English folk artists, predominantly young and comparatively "nu"..
It wasn't all to my taste, but i loved Jim Moray's song.
We just need more, tis all.. Sure if you're a fan of Scottish music you don't love every single concert that BBC Alba plays, but there are so many others to choose from you don't feel so let down by it..