A main stream after DVD?

What kind of mass media will appear as a main stream after DVD? Which one will be like that among Blu-ray disc, Network player, PC-FI? As I watched operas through DVDs a lot, I'm really interested in it. Please.
Ummmm, Bluray discs...

Laser disc is making a comeback.
There is a lot of Opera content on Blu Ray. The audio formats utilized in Blu Ray are far superior to the ones used for DVD, and there are some great sounding players (particularly Sony) in the low $100 range. Blu Ray is the perfect medium for Opera.