Yes I agree that well educated, young and technical blind people from the developed world have found better solutions for using the internet that we could produce with a listen button.
I see this more for 1) people who do not read because they do not know how 2) people who are blind but not technical (maybe they are elderly)
Patient.co.uk say that their listen button is used about 1% of the time. You can see it here http://www.patient.co.uk/health/gout-leaflet