Actually, if you will notice from the SM Aura and Greenbelt 5 stores, a large area of the store is now occupied by gadgets for sale (mostly headphones, bluetooth speakers, occasional turntables, PS3, XBOX). So the owner has tried to adapt by selling other non-DVD/CD related items.
I agree that they should drop blu ray prices. And maybe cater more to enthusiasts (wag na yung mga DVD na walang extra features, full screen, walang subtitles etc) who like 2-discs, with special features.