From what I understand, it's about equivalent but only because people are able to watch a lot more.

The average family before streaming would maybe buy a movie once a month. Now we can binge watch a different series every few days. If we compare 2 hours of streaming to one movie, streaming wins, but we watch much more media then we used to which makes up for the difference.

Also imporrant to note that this is going down as the grid slowly drifts towards renewable. The environmental cost of Blu-ray won't be going down in the next decade.