When I said there's too much text for human beings to read it all I meant that it isn't feasible to pay people to read all text that someone might want to listen to into audio. Like a random blog written by someone in their spare time probably isn't going to hire a voice actor.

I think the case for having all text be listenable is pretty clear. We're all really busy and often our hands are busy but we're not doing something that mentally stimulating. This is an ideal time to listen to an audiobook, a blog, the news, or whatever else you'd like.