That is a really generalizing assumption though, ArcticMoon. There are, for instance, several sighted individuals who i could name off hand, that listen to audio drama, and or, audio books. Audio drama resembles audio described movies by a high degree, especialy narrated audio drama, such as those you can find at Graphic Audio.
Remember, in this content, audio described movies are only different in that they are accompanied with video that is otherwize superfluous if the audio description is employed.
According to beyondwords.io, who conducted research around digital consumption habits of the average american, 78 percent of americans listened to online audio, including, but not limited to, audio narrated content. If true, this means that a larger amount of sighted people may enjoy audio described movies without the visuals than you are suggesting.

Yes, right. But many sighted people would still prefer watching a movie if they have the opportunity to do so, to listening to an audio-described version.

audio discriptive audio is not just for the blind you know. I agree with shaune i have done that with a sighted person. They actualy fine it interesting.