I think Blu-Ray, or possiby the thing that comes after it, will be death of optical storage. Just like how nobody uses CD's anymore, in just a couple of years, hard drives and removable storage will be cheap enough, and internet speeds fast enough, that physical storage mediums will be a thing of the past. Everyone's video files will be on portable hard drives.
Personally, I already do that. I don't buy DVD's any more, I just download movies. I have entire libraries of TV shows on my 1TB (1,000 GB) hard drive. Every single episode of Family Guy, The Simpsons, American Dad, South Park, That 70's Show, How I Met Your Mother, Two and A Half Men, The Big Bang Theory, etc etc etc....and a ton of movies....and I still have 400GB or so left.
I think that in 2 years you will be able to get a 5TB hard drive for $100.
Pretty insane. I remember my first PC, that I had 12 years ago, had a 4GB hard drive and that seemed like loads at the time. Now I have twice that amount on a tiny little memory card thats inside my phone, lol.
I paid about £100 for my 1TB drive about 6 months ago, and you can already get the same capacity drives for half that now. I just saw a 2TB drive on a tech site for £129.99, that'll drop to £100 within 3 months IMO.