Well, there is a blu with new model army on it, The New Model Army Story: Between Dog and Wolf was released also on blu.
As Viv said, image wise there would be almost no gain from upscaling old material to a blu. But a blu has much space and i could imagine a compilation of footage with much background info, picture galerie or even a commentary track, etc., but i don't see a real need for this.
For a new release like a new live-show the use of a blu would make sense because there you can have lossless audiotracks, but again that would be best used with a multi-track audio layout, sometimes it has a cool amtmosphere if the mixing is well done, but mostly i would prefer the stereo-mix anyway.
I like the look and editing of the Between Wine and Blood Live Package (this one i didn't find in the discography section of the homepage?) much more than the Live 161203 footage, though that seems to be the biggest production camera wise, because it was much less those typical "close up-fast editing" type of thing", which i don't like.
To me, what i want when i see a live concert, is the whole stage and the crowd. And the live-editing should be cued and if possible follow the songs. So when there is a guitar solo than you can give me surely a nice close-up, but not randomly, unrythmically edited and not motivated shots of fingers, only the fromtman, etc.
For the future i would like to have a blu release that uses the space to have some extras, but not because of a better image quality.