I'm not sure 0.1% is an accurate reflection of the portion of users with some accessibility issues. Moreover, whatever the portion of users who currently have

I'm not sure 0.1% is an accurate reflection of the portion of users with some accessibility issues. Moreover, whatever the portion of users who currently have accessibility issues is, the portion who will have some is much much larger. Finally: human accessibility frequently seems to dovetail with machine accessibility. Engineering done with accessibility in mind seems to be less likely to result in silos and more likely to present an interface more amenable to automated interaction.