It's not going to be a nail in the coffin by any means. It just means there will be yet even more EU books in the future.
Even in these recent interviews, Lucas has made a point to mention that they have a wealth of books, comics, games and TV shows out there to consider. He's also praised some of the EU books quite a bit . Mostly, however, he just wants to believe they are separate parallel universes. Going forward, I doubt they'd adapt EU books to movies, but I don't think they'll outright disregard and bury them knowing how popular they are with fans. With Lucas relinquishing control to a degree, you never know.