I see your point, but this isn't really new, especially in the teen and young adult markets:
http://en.wikipedia.org/wiki/Stratemeyer_Syndicate
Additionally, I think recent developments mean that more and more authors will skip the publisher entirely and do it themselves. Finally, the idealistic (and probably somewhat naive) part of me still believes that there will always be a market for great content. There will always be publishers and authors who want to create great stuff and do so, even if the market isn't apparent. Yes, this means that the blockbusters will be mostly shit, but every now and then, there will be a blockbuster that's truly great. Look at the TV, movie, and music industries now for examples of what I'm talking about.