Audio books are seeing a resurgence, because of companies like Audible.
Text to speech is good, and is getting better .
Wireless Bluetooth earphones are becoming common place, the increase in convenience and battery life allows people to have them on longer.
Unlike content that you have to watch/read, you can work on other stuff while you listen.
I see a time where we can listen to most of the things we read.
Creates a whole new kind of medium.
News, blog posts and Stories most affected.
Most of the speech generated by machines.
Most of the classic texts available for free on the internet.