To be fair, looking at the numbers, it's amazing how much has physical media shrinked over the years, at least when it comes to films. Three of the top 10 don't even reach the million...
Yeah, it has shrunk alot. Finding Nemo apparently sold 28m on DVD between 2003-2004 and 41m copies lifetime. The top selling blu-ray of all time, Frozen, has only sold 7.5m so far. Physical media is dying even faster for movies than it is for games.