The top comment on the article itself has a great idea to map colors to textures so the blind could identify the colors as well. With the rise of cheap knock offs of LEGO these days, I wonder if one of those could do that.

Lego bricks are injection moulded, so if you put a texture on the sides of the bricks, it will either be impossible to get them out of the moulds or you'd have to have a complex moving mould to release them, which would probably massively slow down production