I've noticed the opposite. The barrier for "publishing" a book is a lot lower now, especially with e-books so the amount of stuff out there has exploded and tons of stuff that would never see the light of day now gets published. The big problem just seems to be a general reduction in quality as a lot of that stuff is just crap - a lot of badly written and cliche stories, plot holes, typos, grammar mistakes, poorly written prose, books that are clearly targeted to an adult audience in terms of subject matter but are written at a 5th grade level, and so forth. To add to that, I'm sure the AI onslaught is incoming, if not here already.
I guess if you stick to something like physical hardcopy books from the large publishers that the local Wal-Mart decides to stock you might see something like what you say, but would be like getting all of your news from one or two cable news networks.