A lot of people love their physical media, they love the flexibility of it, they love the reliability of it, and they love just owning things.
So that continues to be the dominant way that people collect and own
How can you own something if you're not allowed to decide what you will do with it? Since companied like Warner Home Entertainment have been so anti-backup, I don't think buying a DVD or Blue Ray counts as "ownership." Rather, it's merely "possessing", since Hollywood companies insist that these movies are still their property, and not the private property of the paying customer.