Much of the EU was crap.
Yet the Zahn trilogy was not crap. It would, in fact, be a shame for modern Disney to adapt it and foul it up.
Disney is not in the habit of subtracting things from the continuity. Every time they screw something up it causes more lasting damage to the franchise.
I hesitate to call the damage 'permanent' because in theory it can be undone. But significant retcons are like bringing back dead characters. It's a drastic move that has its own set of lasting negative side effects.
It's never harmless to release crap in a franchise with ongoing continuity.
Yeah, the original Zahn trilogy
felt like proper sequels to the films. I enjoyed them for decades after first reading them, although I haven't re-read them in ages. I probably still have my old paperbacks boxed up somewhere.
But the rest of the books? Glorified fan-fic. Some interesting concepts here and there, but soooo many superweapons and Jedi powers getting out of control and yet another Imperial warlord threatening the New Republic and blah blah blah. I read from the first Zahn trilogy up thru the Black Fleet Crisis, and then said "These...really aren't very good." The X-Wing novels were, as I recall, the one exception, but I got into those late in my reading of these books, and just kinda ran out of gas before I got very far with them. The stuff I read was: Zahn trilogy, Truce at Bakura, Jedi Academy trilogy, Courtship of Princess Leia, Crystal Star (ugh), Corellian trilogy, Children of the Jedi (ugh), Darksaber, Black Fleet Crisis trilogy, and then a handful of X-wing novels and the Brian Daley Han Solo trilogy (which I actually kinda love). Oh, and I think Planet of Twilight (pass), and New Rebellion (also pass). In those books, there were only a few that were genuinely good, a bunch that were mediocre, and plenty that I was more than happy to give away.
Personally I thought the books I read in between the release of the prequels were good at the time. I only read them once and the majority were hardcover. As a kid, I thought hardcovers were more important or meaningful. I still have them boxed away.
Certainly the stories in those books (and some comics) were better than what we ended up with in the Sequel Trilogy. The final movie of which I still haven't seen completely.
If it was me, I would start with rebooting / remake the Prequels. But of course, that's not going to happen. So then I would get as far away from the time period of the Original Trilogy. Future or Past.
I never read the stuff after about 1997. I'd been reading most of what was released for about 6 years by that point, and just got fed up.
These days, I collect hardcover books because I like the look of 'em better, and I prefer reading them in bed at night, although I also like having a paperback copy I can tote around if I want to read on the go. But I prefer hardcover. Hardcovers hold up better over time, too, in my experience.
And I've
long been of the opinion that the way to handle storytelling in the Star Wars series is to kick the story several generations into the future such that the heroes of the OT were practically figures of legend by that point (to the extent they're remembered at all).