I don't have huge BluRay library, but I do keep my eyes out for classic movies and movies I prefer to watch more than once or twice.
I also think that with some movies the disk is better, especially with movies that contain a lot of dark scenes. Movies like Gravity, Dune, Avatar or Notorious for example.
Kind of like people switching to streaming music instead of vinyl. The quality might not be as good, but it is less money and less work.