I find the fact that wide letter-spacing helps dyslexic children read very interesting. I would assume that the web and ebooks would be a natural place to give treatment a spin. Being that the problem is so common, content providers may want to address this issue, henceforth drawing attention to themselves and their brands in the spirit of good will...
What if certain content providers had a "loose letter-spacing" option? Would that be a site a parent could feel confident in directing their child?
Could ebooks have a letter-spacing option to allow users to expand line length?
Could automated tightening of letter-spacing over time help resolve the condition?