This isn't a like for like comparison?
"HD" streaming via netflix et al is no where near as pleasant to watch (& listen to) as a plain old DVD (and BluRay knocks it out of the water). OK they may set the resolution to 1080i and call it "HD", but with an awful, AWFUL bitrate it still looks better on DVD at 576p with a higher bitrate.
This article compares apples and oranges... You could just as easily argue that DVDs are better for the environment than going to the cinema once you factor in the staff travelling to work, cost of keeping the popcorn warm, the cinema usually being mostly empty, having to get to the cinema etc etc, but they are different beasts.
I'll happily stream a film that is mostly storyline, or catch up with iPlayer, but for a action / blockbuster, I want detail and sound quality that I can't get at the moment when streaming - until the streaming services let me download the full 4.7GB DVD, you can't compare them.