I think the whole problem with most Accessibility approaches is that... You have government people threatening you with fines if you don't follow the government guidelines. And you get people that need it, reminding people of such laws on Twitter; constantly.
Instead, think about use cases such as devices without good screens. Up/Down/Left/Right/Select and voice into your headphones. Tweeting while walking. Use cases for everyone.
@hugo
I'm building a tiny keyboard with only 16 keys so that it fits onto the backside of an iPhone case (with thumbs on glass). I'm not even thinking about blind people. I'm deliberately ignoring them for now, because contracted (expert-level) braille is too hard for general use.