As my Kindle is still O.K. I can see no reason whatsoever to change it. When it eventually does cease to work I will then consider all the options available at the time. Lack of audio doesn't bother me as I have a good mp3 player that also plays audio books, of more concern is that by making it thinner have they also cut battery capacity?
Best Android apps 2015/2016: Best apps for your new phone or tablet - what apps should I download?