Regarding the remaster of B5: It’ll (probably) never happen.
Star Trek TNG was the first and probably last analogous show to get the remaster treatment. The issue is that, even though the acting was shot on 35mm, post production and VFX all happened at broadcast resolution.
TNG essentially redid the entire post production to bring us updated visuals. By the time CBS/Paramount got around to considering DS9, the financial cost of remastering TNG, plus the move for many people to Netflix, meant expected DVD/Blu-ray proceeds.
DS9 never got the TNG treatment as a result. B5 is in the same boat, needing totally redone postproduction and CG. B5 was a niche show, and the remaster would be an expensive and herculean task. In short, we’ll probably never see it done :-(