Computers have a learning curve. Regardless of all the benefits, people resist.
Same can be said of the ADA equipped computer stations. I know, you hoped if you just dropped some impressive sounding software, like 'Kurzweil 3000' on a computer station all the folks who could benefit from it would magically appear and know how to use it and maybe even teach you a few tricks.
You built it - they will come! Hollywood said so!
I know, I wanted it all to work like a movie too.... All we would have to do would be 'build it' and 'they will come', and they would be digitally literate and aware and informed and, well, as long as we are dreaming, they would vote to fund libraries and convince all their friends to do so too!
And they all lived happily ever after.
Just because someone gets older and the arthritis kicks in, doesn't mean the knowledge to use adaptive technology kicks in. Shoot, even knowing there is something that could help you when your hands tire of typing is a leap! Finding easier ways to do things isn't easy if you have been doing things one way for a long time. It's that scary 'change' thing again and it always brings a learning curve with it.
Heck, I have been looking for an instruction manual for years... one with the answers in the back, so I will know what to expect! Knowing what to expect is what makes 'change' a wee bit more comfortable.