that guy thinks you are going to be very big
all the best. We sure need more people doing ebooks and audiobooks. Amazon is @#$#$ authors with all their exclusivity requirements and insanely high cut that they take
The whole audiobook landscape isn't clear cut yet. In music and video you have a few well-established (entrenched?) players: Amazon, Google, Apple, Spotify (music). In audiobooks there are still a bunch of smaller players alongside Amazon (Apple doesn't do much about audiobooks, other big players are only just starting, see Spotify). There are at least three in every country, I think :)
And the whole thing is further fractured by whether or not publishers and rights holders want to provide their audiobook, and ebooks, or only one or the other. And there are way more publishers and rights holders than there are in music (in music they are also mostly consolidated into a few megamonsters [1]).
And the market is still growing, as more and more people discover and listen audiobooks (and related material like podcasts) during commute, in the car, during daily routines and so on.
So yeah, it's stressful, but interesting :)