I know netflix has been pretty good about their original content, but getting audio descriptions falls on the production company of whatever show/movie is in question, and hollywood just doesn't give a crap. Netflix isn't the place to complain, it's the major production companies.

I can say for sure that it is up to the owner of the streaming rights of the movie, sometimes that's the executive production company, and sometime it isn't. But most of the time, yes it is up to them.
And do you know what kind of response you're going to get from them??? Buy the BlueRay will be number one on the list. 90 percent of Blurays have an audio description encoded onto the disc, now keep in mind I'd call them major production movies. Not the 10 million and under jobs. But every Disney and Warner Brother films I've bought in that format in the last few years has the A.D. in it.
As for it going off to Netflix? Doubtful. Only because, even if its encoded on the blueray, it's still an extra layer of coding/uploading that the film company doesn't have to do.
The netflix catalog has shrunk by half, fifty percent in the last year alone. If I had to guess, I'd bet film companies want to get as far away from digital streaming services as they can.

It is the major production companies who give the AD tracks to Netflix. Tell them that you want them to give their tracks to Netflix more often. At least we got Netflix on board with AD a year ago and boy that was a many year long campaign!

Ok not sure its solely down to the production company, here in the UK we have uk audio description of US show's. Also when season 4 of the mentalist appeared without audio, on complaining to Channel 5, they informed us it was due to the short time between recite of the show and airing that they were not able to get the audio description track setup. This infers that channel 5 where commissioning the audio description not the production or distribution company.

It can't hurt to let them know how much you enjoy it and maybe request it for a specific movie or show. I think it's important for them to know that people use and appreciate the audio description.

I've contacted them and asked for them to put a little AD logo on the shows info page so that we can know beforehand if it's audio described. If you want to mention that too it might get some momentum!