(Perhaps some minor spoilers. You've been warned...)
hmm...TV series, Mini Series, or Full length movie? As much as I love all three of those options, the question is how the mainstream will recieve it? Will they catch or simply scratch their heads?
I remember Mr.Dyack saying the appeal of ED was that of an Indie film, and since only (relatively) a handful of people bought it, it will be difficult to target an audience. As far as a sequel (or Prequel) to ED is concerned, it MAY be possible; it may not of sold well but it did get props at this years DICE and GDC if memory serves correctly. Getting recognition from your peers has to count for something, right?
Of the three options I mentioned, a movie would be least likely; there'd be no way you can put the focus on the 12 characters equally; it'd have to focus on the Rovias line with the other characters having less than half an hour each. A TV series is more feasible, if the episodes were an hour long, each episode dealing with 1 or 2 characters (assuming they put a lot of effort in this) but it would be over in one season. It could probably use this oppurtunity to fill in gaps that the game purposely left blank. A mini series? I don't know much about them, so I can't say much.
Here is a licscense who's source material is like gold. If Mr.Dyack or some other member of Silicon Knights who were involved in the process (Nothing too major, kind of like the Metal Gear Solid remake where Konami is looking over their shoulder) it may be crazy enough to work. But on the other hand, it was a quirky game, but those who love it, LOVE it, like yours truly