Kindle's text-to-speech function

I know I'm a little late on this story, but the Authors Guild objection to Kindle's text-to-speech function is really absurd. If I buy a book I can read it then share it with my (sighted) spouse and no one will complain. If my spouse is visually impaired then I can't share my book--she has to buy a completely new copy. Sorry, but that's just cruel. In any case text to speech has improved in quality in the last three or so years, but it's still painful to listen to after just a short time. It isn't a credible substitute for a well-recorded audio book. The Authors Guild has picked a bad fight.