Is it everything? No. But according to WGBH's media access group, "All major studios now caption and describe all wide released features and nearly all independent studios caption all releases."[1] In 2014, that description was available on at least 88 films released on DVD or Blu-ray[2]. As for television, in the US, the networks and the 5 largest cable stations are required to air about 4 hours of programming a week with description[3].
My point is: The biggest problem is no longer a lack of described content, it's a lack of access, particularly through internet streaming services which have the potential to provide the most accessible experience of all.
[1] http://www.acb.org/adp/movies.html [2] http://www.acb.org/adp/dvds2014.html [3] http://www.fcc.gov/guides/video-description