I'll believe it when I see it happening.
I really don't see VR headsets moving into the mainstream. The point about telly is that most people don't actually watch it. Nowadays it mostly provides background noise while people surf the net or play games on their phones/tables/laptops/computers. On top of that a single television allows multiple people to view the same thing. With VR i'd have to buy a headset for EVERY viewer. I see more downsides than positives for VR as a "replacement" of television.