I almost wish they would make Star Wars '74 into an animated movie. I read the script, never got the graphic novel, though, and thought it funny what still made it into Star Wars '77.
The Star Wars concept as a full movie could be interesting to see, too. Just to see the full evolution of the story.
I started reading Leigh Bracketts script for ESB, with the massive Wampa assault on the Hoth ice palace (aka Echo Base) forcing the rebels to abandon the stronghold.
Even Splinter of the Minds Eye would have made for an interesting movie, the sequel that never was.
Still, I'd love to see Han Solo At Stars End used as the basis for a Solo:ASWS follow up.
So much of the early "legends" was actually pretty good.
Oh, but if they made a trilogy between ROTJ and TFA, Didney would probably choose to make Children of the Jedi, The Crystal Star, and Darksaber.