Perhaps obligation isn’t the right word. To me, the fact that over the past three years or so more and more people have been talking about Despecialized and other such fan interpretations means Lucasfilm would have more incentive to say something, not because it’s owed to anybody but because this may well become a huge financial loss on their part should they not capitalize on it. Of course, the argument could be made that the average blu-ray buyer (hell, even the average Star Wars fan) isn’t clamoring for an OOT release, but if it was announced and marketed right – which I’m sure Disney wouldn’t screw up – they could definitely pique the layman’s interest in seeing “the original masterpiece” or something kitschy like that.