The thing with streaming is that its going to scale with progress as faster internet becomes available and more devices like TVs incorperate that feature inside of them we will see movies become more an open standard. Once users start being able to use a centralised source for their DRM you will see the source materials being able to scale their content to the demands of the users. For example if you buy a projector which displays 2560 by 1600 pixels you could therefore stream that content at that resolution. With Blu Ray or any format you're stuck with however it was produced in the first place.
If you consider a model like Steam where the content is available whereever the user logs in, you could go to a hotel or drive in your car with your kids and have the content you've purchased available everywhere. If you have an internet enabled TV in your bedroom say you buy a recent Samsung, you could have your content available there as well as in your main TV without having to buy/plug in an extra device nor even both carrying your DVDs from one room to the next.
Tease.
