The one thing in our favor is Disney needs a marketing "hook" to sell people beyond the fanbase on buying the movies again, only a few years after the first Blu Ray release from Fox, and the more recent combo packs. (Neither trilogy has ever really been out of print since the first DVD releases.)
Putting Empire of Dreams and Star Wars to Jedi:The Making of a Saga, and any other "lost" extras in would be great, but it's too esoteric to be a selling point to the larger audience awaiting Episode 7.
The originals are really the only trump card left to play.