I think it's an excellent move. Let's face it: all of the episodes are out on disc. So, unless a 'lost' master videotape for a kinescope used on one of the DVDs is found, I don't think there will be any more big releases. Look at what Paramount has done with the Star Trek episodes from the various shows: they're making compilations on subjects like alternate universes, viewer's favorites, and even a Captain's Collection featuring all the Captains from Kirk to Archer. So what's wrong with MPI drumming up interest for the Twilight crowd, especially with the Depp/Burton movie happening? Nothing.
Here's an idea I'd love to see: a documentary on the history of DS fandom, starting with the 'studio kids' and the people who ran fan clubs for the stars during the show's ABC run, like Jay Nass, Dee Kearney, Bob Finnochio, Walter Miller and others. Then, it can segue to the post-cancellation fandom revival from 1975 to the present with people like Kathy Resch, Marcy Robin, Jim Pierson, Ann Wilson, Jeff Thompson and others. Footage from various DS fan events from the past 30 years exists, with footage of stars that have since passed, like Joan Bennett, Louis Edmonds, Michael Stroka and Dennis Patrick. Also, surviving stars could be interviewed with their viewpoints on fandom and attending the festivals. Did you know that John Karlen was the guest of honor at the very first DS convention in 1977?
If anyone out there has seen the movie Trekkies and its sequel, you know what I mean. DS fandom and its rich history (I've been a part of it for nearly 30 years!) should be documented on film.