B5 doesn't need to be re-made in HD...
Actually, yes, it does.
just released in the best possible quality that already exists!
Which, sadly, isn't that good.
It should be noted that the pure live-action scenes were actually filmed in widescreen. It's only the space shots (EFX) that were in 4:3. And since those space shots would have to be redone from scratch anyway, making the new EFX in widescreen would be in perfect keeping with the 'best possible quality'.