A few comments:
Has anybody ever bothered to actually go ahead and remaster a few minutes of these so-called un-remasterable shows to see how it looks, or is this all based upon assumption? Up until I got my plasma at Christmas I was inconsolable over the fact that, based upon what I'd heard, I would never be able to really enjoy any TV programs made before 2005 ever again -- certainly not anything shot on video.
Yet it turned out those old Doctor Who episodes -- and even the frakking Starlost -- look great. I even watched a bit of my Starlost on an HD LCD set over the weekend. Yes, I know it's not a Blu-Ray, but my point being I was told outright to buy an SDTV and keep it in as good a working condition as possible for as long as possible if I never wanted to watch this stuff ever again. And it ended up being bullshit. 42-inch plasma, 720dpi, and it looks fine.
And that goes for The Avengers, Man from UNCLE ... and meanwhile the original Prisoner series which had special effects of even lower quality than TOS got released to Blu-Ray with no problem at all. Funny, so did TOS when Paramount put out its Blu-Rays.
Ah well, as long as Blu-Ray players continue to be backwards-compatible, who cares if B5 gets put on HD or not. Frankly, anything made before a few years ago (for TV anyway) you can't tell the difference anyway if you have a half-decent set. In a couple years you'll be able to download Freeware and do your own up-converting anyway...
Alex