I think it is possible at the moment to develop a web site that is usable by I would say the vast majority. I won't say all - that's probably a bit far-fetched at the moment - but certainly people with visual disabilities, people with cognitive disabilities and hearing impairments and physical impairments can all use with an equal degree of success. So it is a difficult one.
There is probably no perfect solution, but I do know that for the most part people don't like to use specifically designed alternatives.
But it's an emotional thing most of all. It's a bit like saying, you know, we've done a lot of times in our history. You know, 'Black guys on the second bus, please!' or, you know, 'Women in the lounge bar, not the saloon bar.'
We've done it so many times in our history it's just an evolution of that to say that, you know, 'disabled people take the text only site please.' It's a bit of a blow to our ego really and our emotional wellbeing.
Humans like to be part of the gang and we all like to be using the same the same thing. It might be fairly identical, but the emotional reaction is that you're being sent down a different route because you're different I think the solution we'll probably reach ultimately will be sort of content negotiation on an extreme scale.
So when you go to a web site the first thing you'll see is a screen that says "Do you want images? Do you want pink text on a black background or orange text on a green background?" or "Do you want this? Do you want this size text? Do you want simple language? Do you want complex language? Do you want jargon? Do you not want jargon?" and then the content will just be delivered up according to each user specific requirements, but I think we're probably a few years away from that being a practical solution just yet.