To be honest the moment a sequel trilogy was going to be made the old eu canon was going to be removed. George lycas himself never saw it as canon and at best just used a few ideas from the eu or give a little import like the history of the sith with darth bane or palpatine's sith master. Heck his ideas were etheir going to be about the Willis or darth maul and darth talon with having a underground criminal empire. So no thawn or yu zang vong. Plus I doubt genreal audience was to read about 20 to 30 decades of spin of novels, comics and games to understand a sequel trilogy from the eu timeline, they will have so many questions like chewbacca dead, along with why their is a galactic federation instead of a new Republic
yeah true but like i said the replacement isn't better than what was removed