It actually would've helped Disney Canon to keep the EU (somewhat) in tact. If the Sequel trilogy happened just shortly after Legends' 2nd Galactic Civil War, it would've explained why the Galaxy and the New Republic would've been so weak to a First Order take over. 30 years of conflict with Imperial Remnants, Thrawn, The Vong, Killiks, and Jacen Solo would've left the galaxy in a post apocalyptic state, dark ages, and economic depression, undermining people's unity in each other and faith in the Federal Republic/Galactic Alliance.