BluRay hasn't really received significant enough studio attention despite being crowned "the winner" - this is probably because compared to DVD, it hasn't made as big an impact with consumers.

Disney is missing BluRay releases of most of its titles as well as the vast majority of titles it controls for companies like Studio Ghibli. Even Pixar releases on BluRay have been slow. And DreamWorks hasn't released the better bug movie Antz yet either. That one on my mind because my daughter has watched A Bug's Life about 20 times in the past two weeks.